Console collection as of January 2014.

Top-to-bottom, left-to-right:

Sega Master System MK1
Sega Master System MK2, has box
Sega Mega Drive MK1 + Mega CD MK1
Sega Mega Drive MK2 + Mega CD MK2, MD2 boxed
Sega Saturn
Sega Dreamcast, signed by Yuji Naka, former head of Sonic Team
Nintendo Entertainment System
Super Nintendo Entertainment System, NTSC version
Pikachu Nintendo 64
Nintendo Gamecube
Nintendo Gamecube, Metroid Prime variant
Playstation 2
Atari 2600 Jr, boxed
Atari Jaguar, boxed
Xbox Crystal edition, boxed
Xbox 360 S
Philips CDi
Nintendo Game Boy
Nintendo Game Boy Color, Pikachu edition
Neo Geo Pocket Colour
Nintendo Game Boy Advance, boxed
Sega Game Gear, American version with TV Tuner
Nintendo DS
Nintendo DSi, Reshiram/Zekrom edition, boxed
Nintendo 3DS XL, Pikachu edition, boxed
Sega Game Gear, European version, boxed

Not pictured:
Nintendo Game Boy, transparent version
Nintendo Game Boy Pocket, boxed
Nintendo Game Boy Advance SP, Tribal pattern
Nintendo N64, Pokémon Stadium (?) variant
Nintendo Wii
Nintendo Wii Mini
Nintendo Wii U
Sega 32X
Sega Dreamcast, boxed
Atari 2600 MK2, boxed
Atari Lynx MK1, boxed
Atari Lynx MK2
PSOne, Boxed
Box for a Playstation 2 slim model

Everything's in perfect working order except the 32X, which is pretty much shot.