I still have emulators for Metal Marines from super Nintendo that I play every once in a while. I bought 2 playstations so I could play FF7 again, but never did get the game..., still drop in to EQ here and there.
I sometimes play Colonization, the first one. There is something with this game and Civ4 Colonization is not even close.
I have just finished with Grandia 2, a nice old PS2 game (probably it was on Dreamcast too). I also love playing Sonic (really old game), Breath of Fire 4, and Final Fantasy 8.
I still play final fantasy VII. I have the original psx version. I play it on my ps3. But the graphics don't look that nice on a big flatscreen tv haha. And sometimes play super mario world on the pc. And if I'm traveling I play it on my ds.
Basically, all games I play are old, mostly pre-2000. X-COM is nice, we use to play UFO Defense and TFD with a friend of mine each controlling own soldiers, that makes enormous fun. HOMM 1-2-3 of course and many Sega games. It's a pity I don't have time for gaming now, but I'm sure I will someday.