From the summary:
The Web contains thousands of mashups that recombine everything — including Google Maps, Flickr, Amazon.com, NASA, the New York Times, and Wikipedia — with useful information about travel, finance, real estate, and more. By fusing elements from multiple web sites, mashups are often informative, useful, fun, and even transformative. Raymond Yee’s presentation shows you how to create and apply mashups to make sense of the web, especially in the context of libraries.
Source: Library of Congress
