Ever wish there were a Netflix for Books? Well there is, and BookSwim is its name.
You build a queue of books you want to read on their web site, they ship books from your queue, you keep the books for as long as you want, and you return books with pre-paid postage.
Their base plan lets you keep 3 books at a time for $20/month, while their biggest and baddest premium plan costs $36/month for 11 books at a time.
With over 150,000 titles, BookSwim looks like a promising service for the bookish sort.
On a personal note, along with reading PDF's, this is a great way to cut down on cut down trees.
Check out their site HERE. (They are having bandwidth problems right now... but check back later)