I looked into the World of Darkness thanks to VtmB. I was kinda disappointed to find out that they staged an apocalypse for the entire game world and rebooted it from scratch... The new series (Vampire Requiem) has a number of the races missing. :(

Another Elder Scrolls freak here!
Oh, and Warhammer 40k, I guess...

Well, I started recently to read game inspired books. I read all Halo Books (and loved it, as the games too), I read Descent Trilogy (and found it very good and very hard SF), I read Starcraft novels... and next books are comming, I'm looking forward to Diablo novels, Mass Effect novel etc...

Are those any good? I mean I read the first tome of the Starcraft novels and it was really meh :/

I was a big fan of TSR's 'Dark Sun World' RPG so I loved the games 'Shattered Lands' and 'Wake of the Ravager' - of course, I knew all the backstory already having DM'ed Dark Sun for several years :^)
If anyone's interested in these games and is savvy with DOSBox, you can (legitimately) download them from [url=]http://www.darksunworld.com[/url] (it's a fan site that's trying to revive Crimson Sands - Dark Sun Online).
If you're interested in the campaign's setting, check out [url=]http://www.athas.org[/url].

Well, firstly - I should've write "Starcraft novel", as I read only the first one (my bad, sorry)... and secondly - I actually enjoyed it! And I am looking forward to next Starcraft books (I mean buying)...

The game I can remember that most interested me in this sense was the Marathon series, especially the interplay between the AI systems.

Very true. The Marathon series of games has possibly the deepest and most enthralling universe of any I've ever played. That includes Fallout, Myth, and Half-Life. Marathon's story is right up there with all of them. Being a Mac game originally, it flew under the radar of most PC gamers myself included. You can actually download all three games in the Marathon series for free and play them on PC, Mac, or Linux these days. Just check out source.bungie.org/get. It is completely free and completely legal, as Bungie released the games as free ware a couple of years ago. The game is certainly worth playing, especially for those of us who are not deterred by the graphics in early to mid 90s FPS games.
Myth: The Fallen Lords also had a great universe. It was loosely based on a series of books by Glen Cook called "The Black Company". Myth was so good, I went out and read all 10 books in the Black Company series.

Something a bit older, there was a never-completed Amber trilogy of RPGs (only Amberstar and Ambermoon were released). Both games had included maps, runic tables as well as novels describing some of the more important events going on. A real treat for someone interested in game worlds, and it's a shame that Thalion died before the last game - Amberworlds - could be completed.

Glen Cook? Wow! :) I prefer his Garrett series myself, but I've read several of the Black Company series as well. Enough to make me check out the game.

thanks for the tip :)