WorldCat is an international book catalog for participating public, school, and academic libraries, and has 1.5 billion items, including books, articles, DVDs, and CDs. WorldCat Mobile is a free app which allows you to find a library nearby, search for library materials at nearby libraries (not all libraries can afford the fee to display library materials, however), call a library, and map the quickest route to the selected library.
This app is available for iPhone/iTouch, Blackberry, Palm OS, Windows Mobile 5.0, MIDP 2.0, CLDC 1.1 Java, and Nokia. As an added bonus, if you have an iPhone, you can use the camera option with the (pay) RedLaser App to do comparison shopping between Google, theFind, and local libraries.
Read more by accessing the WorldCat Mobile app page.