Are we taking an all time list compilation?
... oh dear. Here we go *deep breath*
Atari 600XL (hand upped the ram to 64K)
A500 (the love of my life)
Tandy XT1000 286 running lots of Gold Box DnD games
eMachines 533Mhz running Windows 2000 and a 56K modem - woooo~!
Home built 1.4 Ghz mutt PC which ended up running 5 simultaneous OS' on it's 20 GB hard drive (Win XP/Mandrake Linux/NetBSD/FreeBSD/LainOS v.0.4)
Aspire One netbook running CrunchBang linux
HP Vista laptop downgraded to XP, Dual Core w/ 2 Gig ram which I later sold to get my current desktop...
2.4 Ghz Dual Core AMD64 w/ 3 gig RAM, 500 Gig hard drive running XP and Linux Mint
NES (toaster and toploader)
Sharp Famicom Twin
Game Boy Color
Game Boy Advance
Sega Master System
Sega Genesis (all three models at one point)
Sega CD (Model 1 and 2)
Sega CDX (currently still own)
Sega Saturn (US, JP and modded)
Xbox (modded w/XBMC)
Neo Geo AES
Neo Geo MVS consolized
Neo Geo Color Pocket
Mattel Intellivision (models 1 and 2)
Coleco Gemini (2600 clone)
... I think I got most of 'em in there. I've had a lot of game systems/Computers but I tend to stick around the Linux and Windows side of computing at current.