A quote from MvMac's site : "Mini vMac is a spin off of the program vMac. It was originally intended to be of limited interest, a simpler version to serve as a programmers introduction to vMac. But vMac hasn’t been updated in some years, and doesn’t have a number of fixes included in Mini vMac, so Mini vMac may now be more generally useful. "
The dude who makes the Nintendo DS port is talking about doing a rewrite of the 68k code for the ARM, which should hopefully get it up to full speed and have actual sound support. The OS runs in semi-slow-mo. I only wish it could fit the desktop into the native DS resolution or use some alternate form of scaling.
There certainly seems to be a lot more options for Mac emulation on a Windows platform (I say "seems" because again, I'm not a Mac person). Basilisk II, SheepShaver,
Gemulator (which also emulates the Atari ST), SoftMac, Worm, Mini vMac, Executor, PearPC, and if you have an older PC there's
Fusion or SoftMac 2000. Heck there's even
WinMac which "Mac-ifies" Windows XP. Granted, half of them have been dropped or not updated for years, but hey, they're still out there.
For what it's worth, SoftMac supports SE/30...

Maybe you could get a little Boot Camp going and have an emulator that auto executes on windows startup... it'll be like you're Dual-Booting 2 Mac OSes instead of Mac/Windows...
