Anime!

MANGA: Went to the story today and picked up the next few books to a few manga's ive been keeping up with. (Ragnarok, Genshiken, The All New Tenchi Muyo) Also picked up the first book based off of Starcraft. (Going to see if its worth it.) Which brings to mind, what about other books that are based in a video game? Like the Warcraft books (or manga for that matter which i enjoyed actually despite having misgivings about it initially), and the Halo books seem to be extremely well written i have heard from multiple people. (With the Fall of Reach being the best of the 3 out). What other books/mangas based on games are good?