My list:
NES
SNES
N64
GameCube
GameBoy
GameBoy Colour
MasterSystem II
MegaDrive x2
DreamCast
GameGear (red version, but not the Coca-Cola one)
PSX (Mark I) not working
PSX (Mark II - chipped) not working
PS2 (the big bulky version)
A500 x2 (floppy knackered on both)
A500+ (battery taken off mobo)
A600 (knackered floppy)
A1200 (Z4 tower, BPPC/BVision)
PC (AMD Sempron 2600+, GeForceFX 5200, 1GB ram)
Spectrum 48k x2 (cover is coming off on one of them)
Spectrum 128k x3 (2 black and one grey)
I think that's everything. The Speccy's, A500s, A500+ and A600 are packed away, but everything else is out ready to play. All the consoles are in the living room and the A1200 and PC are in their own room upstairs.