Students often ask for reading recommendations. The question of where to start is a question of what one already knows and what one is up to. There is no single path to take on. So most of the time I first try to give an overview about different types of literature.
Now I found this mapping of sociology literature (via Sebastién Paquets del.icio.us links) that seems to me a very useful classification in general – a very useful addition to the topical classification you see everywhere.