The most popular API, in terms of mashup count, is far and away the Google Maps API, which accounts for 41% of all mashups. But when it comes to the most popular pair of APIs, Flickr and YouTube mashups are the most common. Not to be outdone, Google Maps joins Flickr in a near second place.
National Public Radio (NPR) has just opened another means for developers to access content from NPR.org: a new API for transcripts. This API provides access to tens of thousands of transcripts from some of the most popular programs on NPR. As we covered last year and in our NPR API Profile, their APIs open-up a range of interesting possibilities.
Music mashups are one of our most popular categories, with over 300 music mashups listed. It also makes for a variety of different types of applications, from lyrics to audio to video and more. The mashups below all use Last.fm, which has the distinction of being used by nearly half of all music mashups.