28: The Witcher 2: Assassins of Kings (PC, also on 360)

Sequel to the unexpected hit RPG from CDProjekt, this was a real showcase for both Western RPGs and PC gamers everywhere. Whilst the mature storyline and characters follow on from the original games (which are in turn based on the fantasy books by Andrzej Sapkowski), the technology and gameplay has undergone a major overhaul. Firstly, CDProjekt created their own engine for this game, allowing them to utilise modern effects and push even the greatest of PCs to their limits. The gameplay was modernised so that it required more skill than in the original as well as adding some interesting new features such as traps and ranged weaponry to keep things interesting.
Like before, the story is heavily influenced by the player (probably more so than most WRPGS though) and the path through Chapter 2 can play out very differently depending on your earlier decisions. The characters also have amazing depth to them, although this probably isn't that suprising considering they've featured in 7 books already. Overall, an amazing RPG with a somewhat annoying cliff hanger ending that has me desperate for more!