Microsoft is one of the first--and certainly the largest of--customers of Wolfram Alpha's commercial API (our Wolfram|Alpha API profile). For math and nutritional searches, Microsoft's Bing now uses Wolfram results.
One of the most powerful aspects of mashups is taking similar data from competing websites and providing a single place to examine the content. In this round-up of the best new mashups we'll look at three apps that aggregate data from multiple services. One looks at location check-ins, another at shared photos and another mashes photos with information about where they were taken.