Do you mean fiction? Like, stories?
If so, I really enjoyed "Liberty's Crusade" by Jeff Grubb, the first Starcraft Novelization- it was VERY well written for a book based on a game. The others were, well, not as strong, but that first book is quite good.
The Drizzt D'Urdan (sp.?) novels of R.A. Salvatore (I.Homeland, II.Exile III.Sojourn) were good enough to hold my attention through 3 books, which is unusual, as well.
Other than that, I'm sorry to say that even though I've read a ton of game-based books, set in worlds from Diablo to Warcraft and many others, most are so lackluster that I find I'm forgetting them the moment I finish reading them. Some, like the Diablo novelizations, I couldn't even finish. As a writer myself, one that's trying to get a publisher for my first novel, sometimes I really wonder where the heck they find these writers to do game-based novelizations... Maybe it's because most of the stories have to go through some marketing department before being published or something (shrug)...