UAE was forked recently (thank god). An effort to merge all the changes made by the WinUAE developers back into UAE where they belong.
This version is slightly faster on PowerPC (not as fast as the x86 version though since it doesn't have a JIT compiler). The sources can be found here: http://www.rcdrummond.net/uae/
The AmigaOS binary wasn't very stable on my system though. AmigaOS 3.9 install hung etc, worked great on my Linux PowerBook though. Sadly I was unable to compile a MorphOS ppc binary as there were some compatibility issues with the system headers. I don't have time to dig deeper into this, hopefully someone else with some more time on their hands could compile a MorphOS native binary for the rest of us.