iTeleport is an excellent application for Mac and PC monitor from your iPad vnc
The configuration is very simple if you use a WiFi network or use the Internet and monitoring via 3G.
The only thing that will be required will be to create a Gmail account, provided you do not already have one.
We talk once the most important question of this type of vnc: vnc speed.
If you plan to watch videos streamed from your computer, then forget it, would be a waste of money.
However, if your use is limited to a less pretentious managing this vnc app will surprise positively.
More info at iTeleport: controlling Mac and PC from iPad VNC