http://www.butterscotch.com/show/Five-Awesome-Web-Mashups
From the page: “This week, Stacy Reed talks mashups. Not the stuff of potatoes or old 70s sitcoms either, we’re talking about ways to find news headlines, music recommendations or even your next apartment. These sites “mash up” data from two or more external sources, take the best of both and present it in an easy to use online format.”