I still have my old N64 and all the games for it, not sure why, I haven't played the thing in years. I'm gonna have to sell it before I go to college anyways... Any takers?
Besides that, I still have Battledrome, Half Life 1 + OpFor, as well as StarCraft. However StarCraft doesn't count because I didn't get it until about 5 or so years back.
I do still have the original Game Boy however. I don't recall where any of the games are though. Also it got run over by a car so while it still "works" the display is practically busted and while you can play it is extremely difficult to tell what you're doing. Wait, that might have been the Game Boy Color...