Sometimes there's just too much interest in open data. The Greater London Authority has temporarily pulled its feed of the Underground due to "overwhelming demand." The service gave locations of every subway train in the city updating in nearly realtime.
Spatial data provider Maponics has released a new API that provides developers with access to several boundary data sets. Previously available as a beta release in February, the Maponics Spatial API (our Maponics API profile) provides access to carrier route, ZIP Code and neighborhood data for the United States.