You can become a Zondervan Advance Reader by going here. From time to time they need people to review books so you get the book for free and then agree to post a review.
Become a part of the Harper Collins First Look program here and it’s basically the same as Zondervan. You get a free book in exchange for a review. From what I saw it’s not a book report type review, just a quick couple of sentances. There’s also one for teens that would be fun for your kids.
I’m sure I’ve mentioned this before but PaperBackSwap is an excellent place to swap books and get some new ones. Check it out here. The site was down when I posted this so check back later!
Looking for a place to donate your used books? Check this post out.