Now that I had so much fun with the iPhone I am thinking about new challenges in the mobile phone development area. The Touch HD looks like a cool target. It has a DX8-class ATI graphics card in there. Probably on par with the iPhone graphics card and you can program it in C/C++ which is important for the performance.
Depending on how easy it will be to get Oolong running on this I will extend Oolong to support this platform as well.