You absolutely MUST stop by Elisa Rolle's LiveJournal and see the book covers on display. It's round one of her poll featuring some of the top artwork and photography from published books and ebooks collected on one page. Best part is, after feasting upon the visual stimulants, you can vote for your favorites and see poll results to date.
Do it all at this link:
Elisa Rolle - My Reviews and Ramblings
My favorite so far is Sheri's work for Accidents Never Happen. I'm a sucker for boxers, and the red landscape behind him reminds me of Munch.