On the boom?
It's a good boom. A little long-winded and hard to follow at times due to obscure early-1990s references, but it is epically graphic and disturbing. There is a lot of mutilation which is described in intricate detail.
It is both a psychological thriller and social satire. Patrick Bateman is the sum total of everything that is wrong with the culture of excess in the US financial industry.
edit- I am currently on my 999999th read of Fight Club, but I think American Psycho will be my next reread even though I'm sort of on a Chuck Palahniuk kick right now.
[Edited by Dhampy, 2/3/2009 6:40:08 PM]