I was addicted as soon as I read My Sister's Keeper which is now being made into a film starring Cameron Diaz as the mother of the 2 girls, not sure about the casting - she seems a bit to picture perfect to fit and portray real emotion for this character.
My favourite of hers is still "Plain Truth" - the story of murder in Pennsylvania's Amish community. I also loved "The Tenth Circle" - about what lengths a father would go to seek revenge.
What I like about her books is the themes about morality - and really make yourself question what you would do in one of the characters situations.
I'm just about to start her new one - Change of Heart. Lucky I've got the rest of the week off so I can get right into it! Will let you know how I get on.