MuscleNerd recently tweeted that there is an official iPad Jailbreak Compatibility List and that anyone can contribute to the list. It is a basically a Google spreadsheet of jailbroken apps and whether or not they are working, working with problems or unusable on the iPad. There is also a place for the tester to add notes and comments about how the app is running. A great resource for those with jailbroke iPads.
Be sure to read the instructions if you decide to contribute to the list.
You can find the iPad Jailbreak Compatibility List HERE.