John Musser has reported that Flickr just reached 68 mashups on ProgrammableWeb. That's around 10% of the total mashups registered on his site. This is a great way to measure the health of a given API in comparison to other APIs of the same class. When looking at all of the APIs you can see Google Maps reigns supreme, but it's interesting to note that relative newcomer (it was added in February) 4
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