I usually have 2 or 3 books 'on the go' at a time. Usually 1 main book and a couple others in different genre that are filler books for when I want a change or am between 'main books.' I also have an Audio book in the go from Audible.com for long car rides and when I want a story read to me.

I usually read at least a book a week, more if I'm on vacation or sick and have extra reading time.
Hubby thinks I'm crazy for having more than 1 book on the go at a time. He reads 1 book till it's done then starts the next. He use to have only 4 books loaded on his Cybook at a time. Then I started finding books for him during the Fictionwise 50% off sales and loaded it up. Now he has a whopping 20 books loaded!!