Java Based Operating System
This is what need Sun. You have portability for Linux/Windows/Mac/The Mars Robot. It would be nice if there was a true Java based operating system that featured low-level drivers based in java. System code based in java. I know the JNode project is out there. But, I will probably take a while till a 1.0 release. But if Sun were to produce such a beast, it would be pretty interesting. And, I believe there are probably Sun Java OSs out there?
Some will argue that Java is not really designed for low-level code? Why not, it is designed for everything else. I think it would present an interesting model for computing. Basically, everything written for the OS would be java based, no more GCC.