Model 100's are awesome machines for what they're capable of. I have several here. A piece of lore behind the Model 100, btw, is that the Word Processing component of it is the last actual production code that Bill Gates personally wrote for Microsoft. In 8085 assembly language.
Hello. I will leap in and express an interest in the B&W G3 also. I currently only have a G3 iMac to run OSX on and would like to get a 'regular desktop' machine. I love the iMac but don't have any Firewire peripherals so it's rather I/O bound with just the slot loading internal CDR...
I have NetBSD running on one of my SE/30's. Here is a page with pictures of it from a number of years back:
http://sasteven.multics.org/MacSE30/MacSE30.html
The 68K port of NetBSD is alive, if not very active.
I put a current copy of NetBSD on one of the slot-loading G3 iMacs I bought a few...