The OpenAddresses R SDK by Scott Chamberlain is an R client for data from OpenAddresses. The library serves to make it easy to retrieve the data, as well as combine data sets and visualization. OpenAddresses is a web portal for the management of Open Source worldwide localized postal addresses.
Google is inviting developers from around the world to participate in the "Google Places API Developer Challenge 2012", a contest that encourages developers to help address the needs of local communities by creating applications that use the Google Places API and available municipal data sources.
Perhaps that Bing-Yahoo search deal is paying off. Even though Maps and Flickr aren't known to be part of the deal, Microsoft has connected its Bing Maps to the Flickr API in a unique way. It overlays geotagged Creative Commons photos over its current StreetSide imagery, as shown in the video embedded below.