I can't just read one book at a time. At any given moment I probably have at least 3 books going on. I have no problem going between them either.
Right now I'm somewhere in...
Where Women Create
Harry Potter and the Goblet of Fire
The 100 Simple Secrets of Happy People
Pride and Prejudice
Plus I'll start reading The Hollow when I get home.
So 2 of the books on the list above I've read before. But how can you not read Harry Potter over and over and over again. I'm really enjoying seeing little hints throughout the books. I havne't read them all since before book 7 came out.