File conversion wonder site!

A friend recently shared the following link with me: http://www.zamzar.com/ .  I would have to put this in my top ten most useful sites on the web.  It will automatically convert files from one format to another: Word to text, wmv to flv, avi to m4v.  It converts text files, images, video, and audio files.  When I think of positive digital citizenship, contributing something useful to the digital world, this is the sort of site that comes to mind.  Thanks Zamzar.