Here's an idea that's been floating around in my "Maemo ideas" list in Maemopad+, but which I have not yet had time to look into, so I'm publishing it here in case anyone wants to implement it: Make photos with the camera on the internet tablet and then have morphing effects (like Cheese) and also a manual stylus-driven "power goo" (like Kai's Power Goo) mode.
I know, it's pointless, but having seen many people having several minutes of fun with the FaceWarp Java app that comes pre-installed on some Sony Ericsson phones, I can see this being a fun app for showing off the Internet Tablet to friends.
Does this sound like a killer app for the next device that is going to have a "high-def camera"? I don't know. It would be interesting if someone tries to get Cheese running on the tablets and have some fun with it. And of course, add these effects to the videophone app, too!