Well, I missed having a Christmas release this year, so I'll have a New Years one instead. I've released CrabEmu 0.1.6 today supporting both Mac OS X and the Dreamcast. There are plenty of changes in this version from the last version, not the least of which being that it now runs on the Dreamcast.
Anyway, for those wondering, CrabEmu is a Sega Master System, Game Gear, and now SG-1000 emulator. It doesn't run perfectly on the DC yet, and there's no sound, but its a good start for an emulator that I never actually intended to port to the Dreamcast.