One feature that’s missing in YouTube is: Lyrics.
With a simple Greasemonkey script you can get the lyrics of songs in YouTube, if the uploader has taken care put proper information about artists, lyrics or concert dates. It works the best if the information about the song is in the songs title.
The script has capacity to search a couple of lyric search engines, however the best one is lyrics.astraweb.com . If you don’t find the lyrics for a particular song you can choose from an alternative source.
You need Greasemonkey extension for Firefox and this Greasemonkey script.
The problem is, this script won’t work for regional songs / videos which has a major chunk of viewers !
Related Post: Lyrics plugin for Winamp and Windows Media Player.