I always have four or five books going at one time.  Short attention span, I guess???  I finish them all, though, so what does that make me?  Right now I'm reading The Love Letter, What Charles Dickens Ate/What Jane Austen knew, Jackie's Wild Seattle and Wild Man Island (to my students at school), Peace Like a River, and I'm rereading Jane Eyre.  Oh, and I just finished The Dante Club on books-on-tape (on my bicycle) and started Wish You Were Here. Seeing it written down like this, I think, "what a nut!"  I guess I got it from my grandma, who did the same thing.  Thanks grandma!  
Shari