There have been many books that I have bought over the years, and it has added up. The bad thing is that there is a lot of books that I regret buying because I just became uninterested. I won't even bother mentioning them along with these that I found worth it.
Scribblings 1,2 and 3 (Dean Yeagle)
Vampire Graphic File (Dark Stalkers)
Breath of Fire Complete Works
Capcom Design Works
Capcom Design Works: Early Days
Chris Sanders Sketch Book 2
Mine Blue (Mine Yoshizaki)
Melange (Dean Yeagle)
Disgaea Character Collection
Disgaea 2 Character Collection
Phantom Brave Character Collection
Phantom Kingdom Character Collection
Queens Blade "Shrine Maiden"
Queens Blade "Armor Girl"
Sky Doll Set
There are other books here I want but seem really hard to get of haven't gotten to it.
Chris Sanders Sketch Book 1
Zealotic Blade Zero
R20 Rockman & Rockman X
So yeah. I like to hear what Artbooks you have gotten or are interested in at the moment.