PubSubHubbub. Say that three times fast. If you're not familiar with PubSubHubbub, it's an extension of the RSS and Atom protocol that allows the feed to push content out when it's updated. That's just the sort of technology we should see from check-in APIs like Foursquare and Gowalla.
If Yahoo shut down its mapping APIs, would anyone notice? Apparently not, as there's been little written about the company's recent announcement that makes official what we've all seen for some time: Yahoo will not be a player in Maps, instead relying on its partner, Nokia. As of September 13, the Yahoo Maps API will go away. The company is already suggesting developers migrate to Nokia's Ovi Maps API.
On its Geo Developers Blog, Google announced time zone functionality for the Google Maps API. Developers around the globe have exhaled a sigh of relief, as time zone functionality has either kept them up at night, required extensive programming, or remained just a bit outside of an apps functionality because it wasn't mandatory (but sure would have been nice).