Been looking for a good wifi mouse and media controller and I think I found the best one, a little pricey though, does...
Touch pad with your chosen keyboard, dedicated scroll section and drag & drop.
Accelerometer based mouse, nice idea but a little funny to use, may be good for presentations.
Media remote that supports Media player classic, VLC, media centre, wmp, xbmc and I'm pretty sure it supports boxee and a few others.
File explorer allows you to browse your media folders and open files on the host PC, great for eliminating drag and drop operations.
Accelerometer based joypad interface, have yet to try it in game, but it acts as a steering wheel so you can tilt the phone left and right to steer, going to try it on something when I get home on tuesday.
D-PAD screen:
Market:
http://www.appbrain.com/app/com.gbmsoftware.gremotepro
Website:
http://gbmsoftware.com/index.php?option=com_content&view=article&id=22&Itemid=3
It's also got a few good features like when the screen locks all you have to do is lift the phone and it will unlock it for you. Sorry for the big post and if it sounds like an advert but I think it's pretty good