« Native » resolution of Google Video:
Google Video seems to offer 400 x 326px, maybe less to allow the
buttons. If you upload a 16:9 the video should be ‘letterboxed’ to
maintain aspect ratio.
UPDATE: 080406 Posted by a Google Advisor
Streaming Quality
Video: 320×240 resolution at 450 Kbps
Audio: 64Kbps Mono
Download Quality
Video: 480×360 resolution at 800 Kbps
Audio: 128Kbps Stereo
Youtube also has its FLV stream at a native 320×240 but there player displays at an odd 450×338 with ALOT of pixilation occuring even at that small a resolution in mono. And downloads are … well there arent any! you can go to www.feelingtea.com and rip the raw 320x240FLV to your hard disk but I wont count that as a download. (YOUTUBE cant handle NON-4:3 aspect videos..
Guba (this is where she shines) Agian there is a 320×240 streamed FLV but there are almost NO compression artifacts and is in Stereo. The video plays in the window at a stretched res of 596×446 and it look beautiful. Downloads.. You get the lot. iPod/PSP MP4 downloads at Variable High Bitrates with improper aspect ratios…. and perhaps the greatest part of guba..
Vimeo now supports HD in 1280×720! To watch: click « Full » in the lower right corner of the player. To create: upload a 1280×720 video and it will automatically convert to High Definition. If you have an older computer, let the video buffer before watching. Read the FAQ at vimeo.com/help/hd.
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http://www.vewgle.com/showthread.php?t=419
-Google requires you have a Gmail acount to sign up to there Video Beta which can be tricky to get since you have to be invited into Gmail(last i checked). Then you must download the upload program and login to that to begin uploading.
-Youtube can be signed up for in a few minutes but also requires a valid Email for confirmation before you can upload.
-GUBA is similar to youtube in that once an account is created you must have a confirmation sent to a valid email before uploading a video
What can be sent? What are the limits on size length and copyright.
-Google has absolutely NO limits on size, length or codec used. (However Ive heard 2 gigs should be the largest) and they are very strict on copyrighted material being uploaded.
-YouTube has limits of 100MB and/or 10 minute max clip size(which sucks) and will not allow SOME (family guy,Porn) copyrighted material on.
-Guba had no length limit on videos but restricts the video to 200MB. And as far as copyright I will quote from there Submission Guidelines
Sending:
–Google video can use a separate upload program to send your videos to there servers.. This is benificial because uploads can be resumed. ahd multiple files can be queued to uploaded. Some filenames are not accepted and you must figure out whats wrong before sneding. then Titling and description is added after the video has been uploaded at your google control panel (Speed is great with 225KB/s sustained upload) NEW you can now upload through the browser like the other two up to 100MB with pre-titling and description. But can still use the upload program to do larger or multiple files.
–Youtube does its uploading through your browser one file at a time and has you title and describe your video before you send it. A cute little java progress bar shows the status of your upload If your browser crashes.. your sh|t out of luck. (Speed is good with up to 225KB/s sustained upload on certain servers but a lower ~150KB/s on there random upload server selection)
–Guba also uploads through your browser but does not offer any progress bar and is not resumable and makes you title and describe before uploading. (Meek upload speed of 85KB/s up are to be expected) 
Verification: (converting to flash and other formats or checking copyright)
–Google takes time to verify, anywhere between 12 hours and several days(no weekend verification). Every video is checked by a human being which takes the time and checks the copyrights. The Web upload however is instant conversion and allows linking, However your video will not be indexed until verified
-Youtube takes anywhere from 45 seconds to an hour to verify. Length restrictions help keep this number consistant.
-Guba SO FAR has been rediculously fast. a 100 meg 17 minute video took 8 minutes and a 5 minute music video took 2. (varies greatly now, can be previewed in 10 minutes and goes live in ~6-8 hours)
Searching: (for only your videos/ others)
-Google has no real way to find ALL of YOUR videos.. you must use a Unique production company name and search that.. However if someone wants to they may copy YOUR name at there will. And any description that has YOUR name or a similar name will pop up in the results.. Searching for specific videos yeilds MANY results (its google people!) however they can be corrupted by a user copying common phrases over and over to increase the relevance of their video to many common searches. Searches can be sorted by Relevance, Date, and Title.
-Youtube can search a user by there username to find all of YOUR videos.. which is nice. and searching for topics is similar to the google problem but usually reveals what your looking for. PLUS youtube can sort by Relevance – Date Added – Title – View Count – Rating.
-Gubu is where this gets tricky to search for YOUR videos you can’t use your user ID Number « 1000003219 », you can’t use your Nickname « Topgeardog » all Ive found is when signed into your upload account you can have the search results page of YOUR videos popup and you must keep that Hyperlink to get to it.. (See my sig). worse then that search results for topics are spartan. Although I know there are dozens of family guy eps on there.. A search reveals.(checking)… 8 results, and although I uploaded a top gear clip and titled it « Top Gear – 300 vs Jag vs GTO » searching « Top Gear » gives..(checking)… 1 result.. of 1 full episode and nothing else. so wheres my clip? Ill update this guide as I find things out. UPDATE, Guba search is out of beta and you can find your videos by searching your username.. However it still pops up as an account number in the search bar. ?Weird?
Quality: (Video quality of online streams and of downloads)
-Google has lowered there FLV streaming quality at least once to cope with bandwith concerns but the quality has not been lowered enough to make pixilaton visible. There native streams are still 320×240 stretchable to fit your desktop resolution in mono. Downloads are GVI- 480xVariable Divx, and MP4 iPod/psp @ 320×240.
UPDATE: 080406 Posted by a Google Advisor
Streaming Quality
Video: 320×240 resolution at 450 Kbps
Audio: 64Kbps Mono
Download Quality
Video: 480×360 resolution at 800 Kbps
Audio: 128Kbps Stereo
-Youtube also has its FLV stream at a native 320×240 but there player displays at an odd 450×338 with ALOT of pixilation occuring even at that small a resolution in mono. And downloads are … well there arent any! you can go to www.feelingtea.com and rip the raw 320x240FLV to your hard disk but I wont count that as a download. (YOUTUBE cant handle NON-4:3 aspect videos.. any non standard video res Is stretched to 4:3 so additional recoding to 4:3 is necessary to maintain correct aspect)
-Guba (this is where she shines) Agian there is a 320×240 streamed FLV but there are almost NO compression artifacts and is in Stereo. The video plays in the window at a stretched res of 596×446 and it look beautiful. Downloads.. You get the lot. iPod/PSP MP4 downloads at Variable High Bitrates with improper aspect ratios…. and perhaps the greatest part of guba.. you can download the ACTUAL file that was uploaded by YOU. so whatever you uploaded you can have back with no loss or res change as long as you login. Sweet! And indexed Usenet files can be downloaded original as well.
Features: (comments, contact, players, etc)
all services have Embedded video, volume controls, Progress Bars and counters
-Google has Playlists to play multiple search results, Play size variable with your monitors resolution, had a 10 second thumbnail previews in search results 15 per page. Email link to friend. The player has the ability to stream immediately from any point of the video without buffering the whole video and the various video downloads. No hit counter, NEW comments, no contact uploader.
-YouTube has makable playlists, 3 static screen previews per video, 20 results per page, full comment/rating implementation on videos and in user profiles. Email link to friend. No vari-size video window(except full screen). Hit Counter, and ability to flag video and contact uploader. NO downloads and no video scanning till its full loaded.
-Guba has downloads, the ability to flag, multiple GIF-like video preview, 20-100 results per page, email link to friend, and a similar video list .. but thats it. NO playlists, Cant scan through videos (but loads faster then youtube)
Embeding: (what this forums is all about)
Exemple
: 
Recherche sur les réseaux visibles/invisibles 