It is a great online service that will convert video, audio, and documents. You upload the file, enter your email address, and Zamzar will send you a note when your new file is ready for download. And moreover - it is absolutely FREE of charge to use.

You can either enter the URL of the video, or use a new browser plugin to automatically find videos to convert on the page you’re visiting.

Zamzar will allow you to convert files from YouTube, Google Video, Myspace, Revver, putFile, Break.com, Apple Trailers, Dailymotion, Metacafe, iFilm, Grouper, and Blip.tv. You can convert files to a variety of formats, including 3GP, FLAC, MP4, and AVI.