Today I successfully recompiled new Darren's source (not without his help, as usual :-) And I'll probably make new version of MAMEBOy available in few days after I polish few more litle things.
The most interesting change from his new source - hiding toolbar - does not work on my EM-500 due to differences in the 2.11 and 3.0 OS :(( If anybody has information on how to hide blue toolbar in the Pocket PC OS, please explain.

No other changes will be made except enabling some more games (Kangaroo, Xevious and Shao Lin's Road) and some more overclock tweaking for speed / stability.