The games I'll still remember when I'm 80...
I'm almost half way there. Been playing games religiously since 1981. New to Giant bomb, but the prospect of making lists is highly appealing. In no particular order, mind you.
Honorable Mention titles: Knights of the Old Republic, Heroes of Might and Magic 2 and 3., Masters of Orion 1 and 2, Microleague Baseball (Unless you're a 30 something that was a baseball fanatic in the 1980's, you won't recognize this title), Second Life (Ok, its not a game, but I made friends there and have poured a ton of hours into it), Vampire: The Masquerade Bloodlines.