Zamzar – A site dedicated to free online file conversion.

Zamzar allows you to transform your songs, videos, images and documents into a variety of different formats. Using Zamzar you can:

Make your PDF documents editable by converting them to MS Word
Convert your ITunes (aac) files to mp3
Upload up to 5 files at a time to convert simultaneously
Take advantage of over 150 different conversion types !

Readers can logon to this site and choose the format to convert.Zamzar converts them and sends the file to your inbox.