I have not seen this here (unless I overlooked it) so I thought that I would post it for you nice people.
The program is called My Mobiler and it's FREE! It allows full control of your PPC from your desktop via ActiveSync. You sould be able to do the same over WiFi but I have not tried it yet. This is from the site:
http://www.mtux.com/
View your mobile screen on your desktop.
Control your mobile by using desktop keyboard and mouse.
Copy/Paste text between mobile and desktop.
Capture mobile screen.
Drag and drop files to your mobile.
Support ActiveSync / IP Connection
