VICE for the Zaurus
With a bit of tinkering, I've managed to make some ipk packages for VICE, the VersatIle Commodore Emulator. I built these by compiling VICE alongside the X/Qt development libraries. To make VICE work, you will also need to install X/Qt and have X windows running on your Zaurus.
Unfortunately, VICE does not run very fast on the SL-C3000. Despite my attempts at compiling the code with optimizations, and turning on swap memory on the Zaurus, unfortunately VICE doesn't run at a bearable speed. I also haven't done anything about VICE's cooperation with the Zaurus keyboard. I'm not sure how to ensure that the function keys (f1-f8) can be operated on the Zaurus.
You can try turning off sound and diabling some other features in VICE to speed it up, but even still you won't be able to play Paradroid - I'm not sure how the joysticks can be configured for the cursor pad.
DOWNLOAD the complete VICE package
DOWNLOAD the Commodore 64 only VICE package