For cost-conscious readers who want to trade, borrow,or buy, these sites are the best things to come along since the public library.

The Postal Service

Trade hardcovers and audiobooks as well as soft covers at paperbackswap.com, and get updates on newly available titles via their daily e-mail digest. Stroke of genius: the online postage program, which allows you to print the postage on a mailing label directly from your computer.