ZamZar : Converts a file from one format to another, totally free

ZamZar is a web application to convert files. It allows user to convert files without downloading a software tool. Users can type in a URL or upload one or more files (if they are all of the same format) from their computer, Zamzar then converts the file(s) to another format.[2] For example, from a Flash streaming media file to MP3. Users receive an email with a URL from where they can download the converted file. Zamzar is currently in the public beta stage of development