If you've got more books than shelf space, think of donating them to the New Orleans Public Library. The library is looking for hardbacks and paperbacks, and books that the library can't use will go to fund-raising efforts or directly to families affected by Hurricane Katrina. Tell the post office you're making a donation, and your shipment can go library rather than book rate. You'll be saving on postage, and you can write the donation off your taxes.
The address is New Orleans Public Library, 219 Loyola Avenue, New Orleans, LA 70112-2007, attn: Rica A. Trigs, Public Relations. For more information, go here.