Of course, if you have trouble selling your books, or if you just don't want to go through the hassle, you can still avoid the tragedy of throwing them in the garbage by donating them instead. For instance, ask friends and family with young children if they would appreciate taking your old kids' books -- they might be able to get more use out of the books, even if they're a bit worn.
Kids' books are also appreciated in local schools or homeless shelters, especially women's shelters where mothers often bring their children. Goodwill, the Salvation Army and Habitat for Humanity are all charitable organizations that accept used books of all kinds and sell them for their cause. Hospitals and even local prisons might accept some donations, as well. And, of course, you can always consider donating books to your local library [source: Sherar].
In addition to the inherent rewards of performing a good deed, you may be able to count your book donation as a charitable tax deduction on your income taxes.