My current inventory:
Macintosh IIcx
Macintosh IIci- upgraded to a 68040/33
Macintosh IIsi
Macintosh IIvx
Macintosh LCIII
Quadra 700- running A/UX 3.0.1
Quadra 950- upgraded to a PowerPC 601/66, running Mac OS 8.1
PowerMacintosh 7100
PowerMacintosh 8100- upgraded to a G3/500, running Mac OS 8.6
PowerMacintosh 7500- upgraded to a PowerPC 604/225, running Rhapsody 5.6
PowerMacintosh 8500
PowerMacintosh 8600- running Rhapsody 5.6
PowerMacintosh G3 (Mini Tower)- running Mac OS X v10.2.8
iMac G3- running Mac OS X v10.2.8
PowerBook Duo 280
PowerBook Duo 2300c- running Mac OS 8.6
PowerBook 3400c- running Rhapsody 5.6
PowerBook G3 (Wallstreet)- upgraded to a G4/500, running Mac OS X v10.2.8
PowerBook G3 (Pismo)- running Mac OS X v10.3.9
PowerComputing PowerTower Pro
Plus I also have a PowerMacintosh G3 (Desktop) and a PowerBook G4 (Titanium) here. The G3 is on lone from a friend and the G4 is a cadaver (practice system).