I completely forgot about Alien Swarm game. That's the BEST addon and one the best co-op games ever made.

its hard to finger a single killer app on PC. If you aren't purely interested in top of the line graphics, then you have 20 years of complete gems just sitting there waiting to get played in almost every genre, adventure, action, FPS, RPG (both action and D&D style story focused based). If you're purely a console gamer since day dot, then you have an entire genre there left discovered (RTS).

I game on PC,ps3,ps2,wii,ds I have my favs for each console (generally geared by control systems I prefer for X game) but I do always return to some of the classics on PC when I want refilling. Currently playing through Baldur's Gate 2 again, graphics are cruddy but by-joy is the game itself steller (and its a reasonably new game, released 2000, built on a game engine designed ~1998).

Real Time Strategy, MMO, Point & Click Adventures and Simulations (building, space, life, any kind of vehicles) are still the genres that are very strong on PC and very weak or non-existant on consoles.

The two bestselling PC games of 2009 are not hard to guess: Starcraft 2 and The Sims 3, but they are not "Killer Apps". They might attract new PC gamers, though.

"Killer apps" don't exist on established systems, this term only applies to games that sell new systems (Wii Sports, Brain Training and Nintendogs were the last "killer apps" I can think of).

I dunno.... I predict a huge rise in newish PC sales in Korea when SC2 launches.

Mount&blade
The Witcher
Stalker
Empire Total War
Left4Dead
Diablo3
Starcraft2
Dawn of War 2
Alan Wake


Just some games ...

I have to correct myself: "Killer apps" on established systems are possible. The last game that attracted lots of new people to PC gaming was World of Warcraft.

@vlad: Yes, that's possible (and not only in Korea). Maybe I'm underestimating the impact of SC2. The weeks and months after release will be interesting.

I heard Sins of a Solar Empire is good. I think it's PC exclusive.

FPS games are better on the PC than on any consoles. They generally have better control and better online.

Look at Counter-Strike for an example of this. It was awesome online well before the original Xbox came out. And it still is awesome online for the PC, but it sucks on the Xbox.

Yes, good RTS games like Starcraft 2 and Warcraft 3 are (or will be) better on the PC. Yes, MMOs are better, but I don't dig MMOs. And I still like some PC gaming.

Half-Life 2 and Starcraft