If only I had seen this before I moved...

PaperBackSwap is a place where you can trade paperbacks with other booklovers, thus ensuring that you find a good home for the books you're done with while replenishing your own store of books with things you want to read -- all for just the cost of postage. Check it out.

(Then again, good thing I didn't know about it or Science Boy would have had to help me put up even more bookshelves...)