As an iTunes user and Rio Receiver owner, I was extremely frustrated by the fact that I could not easily export my playlists from iTunes to a format usable by my Rio Receiver.
I noticed there were some programs for OS X that help with this, but I did not find any for Windows.
So, I wrote a quick program for Windows that parses the iTunes Music Library XML file and exports the playlists as standard m3u playlist files.
Since this was useful to me, I thought I would release it and let everyone else use it. It is Free and Open Source, so there is no cost or anything.
Please let me know if you find it useful, and if you have any feature requests or issues.
You can download it from: http://www.ericdaugherty.com/dev/itunesexport