If you're interested in developing maps mashups using the Yahoo! Maps API but have not yet had the chance to use those APIs, you're in luck. There's now a very good book to show you the way, Yahoo! Maps Mashups by Charles Freedman.
iDreamBooks, book review aggregator, deems itself the "rottentomatoes.com for books." iDreamBooks searches reviews across media outlets and compiles the data to a single, comprehensive repository of review. iDreamBooks offers developers access to the reviews through the iDreamBooks API.
For snap-happy smartphone and tablet users, having somewhere to store their treasured pics is probably very appealing. Photo books have been a trendy favourite for a while now, and Printzel is an app-powered platform that allows users to create their own printed photo books directly from their mobile and tablet devices. The company also provides the Printzel API that now makes it possible for developers to offer printed books from their own applications.