> I think I read somewhere that MAME now emulates itself because some bootleggers made > "33 in 1" arcade boards that run things like Ghosts and Goblins under an old version > of MAME. Is this right or am I getting confused?
Correct. 39in1 has been in MAME for over a year, and Tim S. has the newer "Happy Fish 302-in-1" up and running but hasn't submitted it yet.
MESS also can run Android 1.6 (emulating a mobile phone development platform) so we should be able to run MAME4All inside MAME/MESS ;-) And with the recent impressive i386/486/Pentium progress in MESS, it shouldn't be long before we can run MAME 0.01.