Geocoding involves converting a description of a physical address into coordinates that represent that location on a map to perform spatial analysis. This tutorial on the Google Maps APIs blog describes the two approaches to geocoding with Google Maps APIs, and when to use them.
The most popular API, in terms of mashup count, is far and away the Google Maps API, which accounts for 41% of all mashups. But when it comes to the most popular pair of APIs, Flickr and YouTube mashups are the most common. Not to be outdone, Google Maps joins Flickr in a near second place.
Google has released a new version of the Google Visualization API that features new chart types including sankey diagrams, calendar charts and annotation charts. The release also includes new features and improvements such as string to number conversion in datatables, the ability to export corecharts and geocharts as PNGs, and crosshairs for scatter, line and combo charts.