The Edgar Awards nominees (Mystery Writers of America) have been posted here. I really enjoyed Gentlemen & Players by Joanne Harris, but despised The Virgin of Small Plains. My reviews of these novels are both here under July 2006 Reading. Have not read any of the other nominees for Best Novel. I've read a couple of novels by Denise Mina, dark mysteries set in Edinburgh. The Janissary Tree has an interesting cover and concept.
Under the category of Best Critical/Biographical - both look interesting: Unless the Threat of Death is Behind Them: Hard-Boiled Fiction and Film Noir by John T. Irwin and The Science of Sherlock Holmes: From Baskerville Hall to the Valley of Fear by E.J. Wagner.
Link to the Edgar Awards is via Shelly's Book Shelf. Thanks, Shelly. By the way, she has links to other genre awards lists.