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.
It's been over three months since Foursquare announced V2 of its Foursquare API. At the time the company announced that its original API would no longer exist sometime this year. With an announcement to its developer list, Foursquare has now made the exact date known: August 1, V1 will be no more.