YouTube Ratings Preview is a Firefox extension (also available for Chrome) which makes it easy to find the best-rated YouTube videos.
Once installed, a Likes/ Dislikes bar under every video thumbnail will give you an immediate idea of video popularity (just look for clips with lots of green, and minimal red).
If you're looking for something more precise, just hover your mouse cursor over the bar to see the percentage of likes and dislikes, and the number of votes.
And it's worth checking out the YouTube Ratings Preview value, too - it "rates every video with an intelligent score from 0 to 10".
Verdict:
Well designed and a real time-saver
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Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Get an overview of your Chrome/ Firefox/ IE addons
Make it easier to focus on online videos in your web browser
Make it easier to focus on online videos in your web browser
Check out the next version of Firefox before it's released
Check out the next version of Firefox before it's released
Check out the next version of Firefox before it's release
Check out the next version of Firefox before it's released
A powerful FTP client with many useful features