well, the book i'd recommend changes ever few days... but at the moment, fingersmith by sarah walters. all that and a lesbian sex scene!
Other than that i'm a big fan of david eddings, esp the belgarid/mallorean. my rabbits called polgara coz hes black with a white bit on his forehead.
also: girl, interupted by suzzanna keays is far better than the movie, and ranks alongside the bell jar (sylvia plath) for that kinda thing.