I dont know if any of you use a plugin for winamp called R4?? Its a great piece of visualization software, with hundreds of amazing visuals.
It comes with an inbuilt webserver, that you can access from another PC or a second screen on the PC running the visuals... This is mainly for mobile DJ's etc who use this software, as it allows them to control scenes, enter scrolling banners and special anouncements etc...
So now i have set up my Wifi connection to my N80, i thought i would see if the remote control site works...
The answer... YES! It takes a while to load (30 seconds), but once its up, you can scroll between all of the visuals, and with one click, instantly the remote computer playing the visuals on a massive projector does exactly what you tell it to!

This is a screenshot from my phone, showing you how it looks, ofcourse you can use the # and * button to zoom in and out of images...
Let me know if you give this ago, if you run into any problems.
Im currently developing a WindowsMCE / MYTH like interface to run on the N80, which will hopefully control my whole home cinema set up!!