I don't have a large collection. But i am working on it.. :-D
Commodore:
(3)A500, (1)A500+, (2) A2000, 1 A1200 in tower and working, (3) spare A1200 motherboards, CDTV, CD32, ++ psus, joysticks, etc... plus peripherals for some Amiga computers...
IBM compatible PCs:
several older motherboards and cpus, socket 370 and up... (some of which are dead or faulty)...
A {bleep}load old PCI, ISA and AGP cards. have lost count...
Game consoles:
sony PS2, CD32, xBox (w/xbmc), Nintendo DS, N64...