PC World: The iPad has recently been jailbroken. Even if you've held off jailbreaking your other iPhone OS devices, the iPad's substantially faster hardware and difficult-to-define "3rd device" role make the best case yet for jailbreaking. A user- and developer-updated compatibility list will help you see what's safe to install on your iPad, and I'll list my favorite apps and extensions for your freshly jailbroken device.
Personally i don't think the iPad needs to be jailbroken - makes more headaches than its worth.