The first series that I found that the boys really loved was the Geronimo Stilton Series of books. This year as in many other years my boys have read all of the books I have and are looking for new one.
I also try to keep nonfiction text around that deals with what we are talking about in class. The boys seem to gravitate to the nonfiction text.
I am always looking for new books for the boys in my class. This is a great Linky Party! Sorry have to cut this short, my two year old is on my lap looking for attention.