Plinky asked, "What's the most interesting biography or memoir you've read?"
Anais Nin's books come to mind right away, honestly. They're so intense and sensual that they've stuck in my mind, although I only read them once and my copies disappeared 20 years ago.
Camryn Manheim's autobiography was quite good, too. I don't read many of that genre (or haven't since childhood), so I don't have that many books to choose from here.