As many old great games as possible! Dungeon Keeper, Startopia, Rollercoaster Tycoon 2, Freelancer, Locomotion, Capitalism 2, Rise of Nations, Warcraft III, Starcraft, Halo: CE, Black & White, Rails Across America, Neighbors from Hell, The Movies, etc.

Also, League of Legends and World of Tanks!

The godfather would be awesome.

World of Tanks, i hope.
As i know game is great.

Diablo 3 and battlefield 3 xd.

Carmageddon 1 & 2.

I want Fahrenheit back :(

All the games! I like having all my games in one spot.

timesplitters 2 needs a remake it was one of the best shooters ever created to date

Fifa 12 -,-''

I'd like to see the rest of the Mystery P.I. series: Stolen in San Francisco, The London Caper and The Curious Case of Counterfeit Cove. I have the first 4 they offered on Steam. I specifically want to buy these games on Steam, because EA/Pogo isn't getting anymore of my money! Steam rocks!!

EA new titles, Diablo III, Metal Gear Solid series.

Carmageddon (plus Splat Pack), Carmageddon II: Carpocalypse Now!, Carmageddon TDR2000 (plus Nosebleed Pack) and Carmageddon: Reincarnation (which will be released on Steam anyway, but I'd really like to see it here now). They're some of my favorite games and I'd love to add them all to my Steam library. Also, I'd love to see Disney games on Steam, such as Split/Second and LEGO Pirates of the Caribbean, Prey 2 (please don't be cancelled) and of course Origin-exclusive titles (Mass Effect 3, Crysis 2, Star Wars: The Old Republic, Battlefield 3) because Origin simply stinks. The only other one I can think of is KOTOR 2, because only having the first one makes no sense. Oh, and Tony Hawk (particularly the Pro Skater titles since they're great games) and Skate games (can't play the latter because I don't own a console).

NOLF series, c'mon WB/Monolith, FEAR is already available on Steam!! :(

Anyone said Minecraft? And Battlefield 3 :DD

HALO 4 :D

Soldier of Fortune 1&2.
Cause Raven Software is best develoers ever.

Spider-Man(2000)
Cause it's best Spidey game ever)

Kill Switch.
Cause it's grandfather of all TPS with covers(yes, i speak about Gears of War)))).

FALLEN ENCHANTRESS!!

Wow, no one has mentioned 'Unepic' or 'To the Moon' yet

I haven't played either but really want to, heard great things and they look awesome/right down my alley.

I sat down to think of things to write in this thread, and I can't. There are so many good, older games that I'd love to see on Steam. Not to mention the bevy of console exclusives that I'd love to have on the PC, period. I'm just happy when more stuff is on Steam, especially when they add games other than new releases.

I would love to see Shenmue. If only they wouldn't do such a lame job of porting the Dreamcast titles over D:

MGS Series!!

Blizzard games because they are awesome.

Mortal Kombat 9, Halo series, God of War, Killzone series.

Offspring Fling
I think the developer (Kyle) has a good start and could continue his career with more support through Steam

Wanderlust: Rebirth, The Great Escape, all Rayman games, Unepic, Wiggles, Knights of the Temple 1 & 2, Commandos, Planet Alcatraz.