Besides Halo and Halo 2, there's finally another title I still own that's emulated -- Counter-Strike. I only own it still because I kept it until I wouldn't get jack for it in trades or eBay and because it's one of the original, pre-ordered limited edition and numbered copies.
I haven't ever seen one of them on eBay, but never checked eBay for the game until it had been out about 12-18 months. All I've seen since are regular copies, but I haven't checked but maybe 5 times.
Even though it's numbered, limited, and quite possibly very rare, I'm sure it's still worth squat on eBay so that's why I still got it.
Anyway, I may throw it in when I get bored or finally finish playing Saint's Row. See if anyone is still online with it (I doubt it) and see what it looks like in WS, 720P, and with AA.
The only other title I'd even try, if it WERE emulated that is, is RTCW, but it isn't. Too bad, too, because this was IMO the best Live title ever back in it's day. Not only in gameplay but in Live features. I doubt it'll ever be emulated because of all the updates they made for it on Live to stop cheaters, but who knows.