Don’t like downloading YouTube videos with a .flv extension? Like a specific song that you heard, and want to download it? Using KeepVid and VidtoMP3, you can do those exact tasks with a few simple clicks.
KeepVid allows you to download YouTube videos in .MP4 format or .flv, both are playable, but for the .flv extension, you will have to convert it to a .wmv or another media format.
As for VidtoMP3, you can easily download/rip audio from YouTube video in just a few seconds in a .MP3 extension.