There are a number of ways to discuss API popularity. Our metrics are based on developer engagement. The "track" functionality on ProgrammableWeb lets developers declare an interest in receiving updates on particular APIs. Which APIs and categories are seeing the most activity.
The New York City Economic Development Corporation (NYCEDC) has announced the opening of public voting for the NYC BigApps 2.0 Competition. The big apple has wasted no time in following last year's successful competition with 350 datasets from over 40 agencies. From the looks of the apps, the NYC tech community is already fired up about the competition.