Charming topic tags, there, moz.
Anyway, here are some photos of my collection. They were taken a while ago.
This was taken when I briefly owned a Dingoo A320, before it self-fried and had to be RMA'd, which is why there's an A320 in the picture.
From left to right, top to bottom (sort of), it shows my DSi (since traded towards a relative's 3DS, as I had no use for it once the System Transfer tool became available on my own 3DS), Rockman EXE 2 limited edition Game Boy Advance, Game Boy micro, Game Boy Colour, Game Boy, WonderSwan SwanCrystal, NeoGeo Pocket Colour, Jungletac OneStation (yes, the cartridges do slot into the top like that - it's actually attached to the system), Performance Designed Products VG Pocket Max (which if memory serves is actually a rebadged Jungletac device), Brain Games Colour*, one of the numerous Mega Drive handhelds*, and a Dingoo A320 (which, as mentioned above, was returned not too long after this picture was taken - alas, it fried itself so early that I never got to use it, at which point I decided that trying to get something to tide me over until the Pandora shipped wasn't going to work out).
*These two were given to me as gifts, and whilst they're interesting hardware (particularly the Brain Games Colour, for reasons I'll get to in a moment), I was never much of a fan of Sega's games and these didn't really change my mind. The Mega Drive one is the rarer version that has Ristar on it, which is nice, although unfortunately this hardware was poorly-tested and is very unstable (it crashes a lot, and will lock up if using the TV-out - it, and the other related consoles to this, is not based around an SoC, but instead a bad emulator written for the hardware). The Brain Games Colour (which, though little known, is an officially-licensed product - it was exclusive to the British catalogue-store chain, Argos) is interesting because as far as I'm aware it's a Master-System-on-a-Chip handheld, and it has some somewhat obscure games on it that don't usually appear on Master System or Game Gear based multi-game handhelds, such as Psycho Fox and the Snail Maze game from the firmware of the original model of the Master System.
Also, there are a few things I never included in that picture;
Firstly, my MegaMan NT Warrior (dubbed version of the Rockman EXE anime) Advanced PET. "PET" is short for "PErsonal Terminal", as per the MegaMan Battle Network video games.
My Mega Man X helmet game. It's nominally a keychain, but it's actually huge - it's not much smaller than the Advanced PET above.
And here is my Pandora and my Nintendo 3DS. They complement each other very well, and I try not to go anywhere without both of them. In this shot, taken on the launch day of Steel Diver for the 3DS, they're both running games with an underwater theme.
They're pictured on some large-sized AR Cards that I had professionally printed.