Ah, hell, I guess I'll put mine up -
MMO's - Aces High II (if I had the cash): love the open world, drive whatever you want, GTA style to it, great flight sim as well.
Eve Online (again, if I had the cash): great open world element, however, don't like 'tactical' point-and-click navigation, great for long distances, but not in battle.
Uncharted Waters Online (thank god it's free): again, open world, and again, don't like 'tactical' navigation.
Interesting note about Eve and UWO, along with others, is that the only choices of pirate-based MMO's is sometime in the 1600-1700's or distant future. There is no "middle ground." Crimson Skies is as close as it gets, without the "Massively" of Multiplayer Online games. One of the reasons it's my favorite, though.
Other - Il-2 1946: open world, little to much "simulation" though.
Battlefield - Bad Company 1&2: love the driving anything element, with a great destruction engine.
1943: love flying the planes (unfortunately, so does everyone else).
Red Faction: Guerilla - great destruction and "blow stuff up" engine, along with a large array of unique vehicles to drive, unfortunately left out in multiplayer.
Grand Theft Auto Series - love, and still have, all of them, except GTA 1 and the London pack.
Red Dead Redemption (along with Nightmare and even the original Revolver) - old west version of GTA, really different from most "wild west" based games, with great music.
They're the only console I have, living on a delivery boys wage.
Montana Zeppelin & Radio Company