All system conditions are from memory and actual results may vary.
Game Boy- Still works, scratched up a bit.
NES- Appears to be in decent physical condition overall, although the 72-pin connector is a different story. Does not work. Controllers are almost unfunctional.
Game Boy Color- Numerous scratches on screen (and on the Game Boy Color itself), dirty, smudged screen, still works. In my brother's possession
Sega Genesis- Near-perfect working condition, albeit loose buttons on controller. Currently located in Omaha, Nebraska.
Sega Game Gear- Still works, as far as I know. Lacks the required 6 batteries.
Game Boy Advance- Bought used: Scratches on screen, dirty, lacks cover for battery compartment (came with rechargable battery pack). Currently in my brother's possession.
Nintendo 64- Dead. Fried by lightning.
Nintendo 64 #2- Perfect working condition. Minimal physical damage. Probably still one of my favorite systems. Highly coveted (at least, the games are. My friends all want to buy my second copies of smash bros. and Goldeneye). Controllers' joysticks a bit loose; moreso in transparent purple controller.
Game Boy Advance SP- Near-perfect physical condition. Slight discoloration/peeling of labels on the back. Screen a tad dirty. Rarely used anymore (although I couldn't put it down after I got Final Fantasy: Tactics Advance).
Xbox- Perfect working condition. Controller a bit banged up. Probably going to last a while.
PS2- Perfect working condition. Used to have problems with DVDs but not anymore. Controller's X button getting a bit sticky. Hopefully going to last a while (darn Sony, making easily-breakable stuff).
Nintendo DS- Perfect physical condition (sans screens). Works like a charm for DS games. Sometimes doesn't read GBA games, but that's fixable by removing and re-inserting the game. Touch screen has one or two big scratches, with many tiny, unnoticable ones near middle of screen, but practically flawless compared to screens of other people's DSs that I've seen. Screens a bit dirty here and there, with dirt lining the screen's edge. L and R buttons a teensy bit loose.