Here's my current list of consoles and handhelds. I have most of my systems posted on my tumblr, so I'm going to add links to several of the items listed and throw a few older pics at the bottom, instead of flooding the thread with tons of pictures. And I'm sure I've missed listing a system or two.
Nintendo
Color TV-Game 15 (Model CTG-15V) (JPN) [boxed]
2x Famicom (JPN)
Famicom Disk System (JPN) [boxed]
Sharp Twin Famicom (black/red - JPN)
NES
Super Famicom (JPN) [boxed]
Super Nintendo
Nintendo 64 (dark gray) [boxed]
2x Nintendo 64 (JPN) (dark gray)
Nintendo 64 (JPN) (gold)
Nintendo 64 (JPN) (Daiei Hawks Limited Edition - clear orange/clear black)
Nintendo Gamecube (black)
Nintendo Gamecube (silver) [boxed]
Nintendo Gamecube Henshin Tigers Limited Edition (JPN) [boxed]
Nintendo Gamecube Enjoy Plus Pack set (JPN) (Spice Orange) [boxed]
Nintendo Wii (white) [w/ box]
Nintendo Wii U (black) [w/ box]
8x Game Boy (original grey)
Game Boy (JPN) (red)
Game Boy (JPN) (clear/skeleton)
Game Boy Pocket (JPN) (gold) [boxed]
7x Game Boy Color (purple, 2x Atomic purple (JPN), 2x pink (JPN), 2x teal (JPN))
Game Boy Color (JPN) (Daiei Hawks Limited Edition - clear orange/clear black)
Game Boy Color (JPN) (Hello Kitty Limited Edition - pink)
Virtual Boy (missing stand)
Virtual Boy [boxed]
4x Game Boy Advance (silver, glacier, Fuchsia (JPN), orange (JPN))
Game Boy Advance (Toys R Us Edition - Midnight Blue)
4x Game Boy Advance SP (pearl blue, 2x pearl pink (JPN), silver (JPN))
Game Boy Advance SP (JPN) (Famicom Color edition) [boxed]
Game Boy Micro (JPN) (Famicom Edition - red/gold)
Nintendo DS (silver) [boxed]
10x Nintendo DS (JPN) (red, graphite black, 2x starlight-white, 5x silver, 1x damaged-touchscreen silver)
2x Nintendo DS Lite (black, white)
Nintendo DSi (pink)
Nintendo 3DS system (Zelda: Ocarina Limited Edition) [boxed]
Nintendo 3DS system (blue w/ Luigi's Mansion: DM game) [unopened]
Nintendo 3DS XL system (Red Pokemon X/Y Edition) [boxed]
Nintendo 3DS XL system (Zelda: Link Between Worlds Limited Edition) [Sealed]
Nintendo 3DS XL system (Mario & Luigi Dream Team Limited Edition) [unopened]
Nintendo 3DS XL system (Retro NES Limited Edition) [unopened]
Nintendo 3DS XL system (Red Super Smash Bros Edition) [unopened]
Nintendo 3DS XL system (Persona Q: SotL Limited Edition) [unopened]
Nintendo 3DS XL system (New Super Mario Bros. 2 Gold Edition) [unopened]
Nintendo 2DS system (blue/black) [unopened]
2x Nintendo NEW 3DS XL system (Majora's Mask Limited Edition) [both unopened]
Nintendo NEW 3DS XL system (Monster Hunter 4 Ultimate Limited Edition) [boxed]
Sega
Sega Master System
Sega Genesis
Sega Genesis II
Sega Genesis 3 [the compact-sized last release]
Sega CD (ver. 2)
Sega Saturn
Sega Saturn (JPN) (gray/black) [boxed - HST-0004]
6x Sega Dreamcast [All are the original white-grey]
3x Sega Game Gear (black-gray)
Sega Game Gear (JPN) [boxed w/ J.League game]
Sega Game Gear (JPN) (Coca-Cola Edition) [boxed w/ game]
Sega Game Gear (JPN) (Coca-Cola Edition)
Sega Game Gear (JPN) (Magic Knight Rayearth Edition) [boxed w/ game]
Sega Game Gear (JPN) (Magic Knight Rayearth Edition)
Sega Game Gear (JPN) (yellow) [boxed]
Sega Game Gear (JPN) (yellow)
Sega Game Gear (JPN) (sky blue)
Sega Game Gear (JPN) (clear black/smoke)
Sega Game Gear (JPN) (GG-White Limited Edition - complete in white suitcase)
Sega Kid's Gear Game Gear (JPN) [boxed w/ game]
Sega Kid's Gear Game Gear (JPN)
Sony
Playstation
PSone
Playstation 2 (black)
Playstation 2 Slim (black)
Sony DESR5100S PSX DVR Media Player (JPN) (rare silver version) *** A PS1/PS2/DVD burner/DVR media device ***
2x PlayStation PSP-1000 (black)
Microsoft
Xbox
Xbox 360 (Halo 3 edition)
Others
Atari 2600
Intellivision I
TurboGrafx-16
NeoGeo AES (JPN) [boxed]
NeoGeo CD (JPN) [front loader version]
3DO
Bandai Playdia (JPN) [boxed]
Apple PiPPiN Atmark (JPN) [boxed - unused]
Casio Loopy (JPN) [boxed - SetB bundle gift set]
Casio Loopy (JPN)
Bandai WonderSwan (JPN) (skeleton black) [boxed]
5x Bandai WonderSwan (JPN) (skeleton black)
Bandai WonderSwan (JPN) (skeleton red)
2x Bandai WonderSwan (JPN) (skeleton blue)
2x Bandai WonderSwan (JPN) (skeleton green)
3x Bandai WonderSwan (JPN) (silver metallic)
3x Bandai WonderSwan (JPN) (blue metallic)
Bandai WonderSwan (JPN) (pearl white)
Bandai WonderSwan (JPN) (Tare Panda no Gunpey Limited Edition)
Bandai WonderSwan (JPN) (Sherbet Melon Limited Edition two-tone)
Bandai WonderSwan (JPN) (Frozen Mint Limited Edition two-tone)
Neo Geo Pocket Color (JPN) (clear/crystal blue)
