Zamzar - Free Online File Conversion

Have you ever wanted to convert files without the need to download software ?
Someone send you a file and you don't have the right application to open it?
Want to convert a PDF to Word so you can type in it?

Zamzar is a free site (supported by advertising) that lets you email or upload a file and then be emailed when it has been converted.

http://www.zamzar.com/

You can convert many different document formats (CSV, DOC, ODP, ODS, ODT, PDF, PPT, and PS) to your choice of many formats including DOC, HTML, MDB, ODS, ODT, PDF, RTF, CSV, XLS, XML, PCX, PNG, JPG, THUMBNAIL, TIFF, PS, TXT, PPT, and SWF depending on the original format.

You can also convert audio and video files to other audio/video formats.

The only two negatives I could find are that is wasn't 'instantaneous'. It took a few minutes between uploading and receiving the email with the link to the converted file and it doesn't convert MS Publisher files.