Engadget has an interesting entry
in their current PSP Hack contest that details setting up a
PSP-compatible web-based controller for iTunes that effectively makes
the PSP an iTunes remote control.
If you don't have a PSP, you can still implement the hack, which basically sets up server-based control of iTunes, and use it as a means to control your iTunes via any web-browser. It's a close to two year old hack that has been repurposed for the PSP. Check it out.