Read all about it. Excerpts:
"Available in thousands of libraries across the country, the programs work like this: First you need a library card, access to the web, and some easily downloadable software -- the Adobe Digital Editions, the Mobipocket Reader or the OverDrive Media Console.
At that point, just browse around the library's website, select some titles, add them to a digital book bag and click the download button. If the title isn't available, it can be placed on hold for downloading later."