Our API directory now includes 97 games APIs. The newest is the Ryzom API. The most popular, in terms of mashups, is the SecondLife API. We list 7 SecondLife mashups. Below you'll find some more stats from the directory, including the entire list of games APIs.
VirWoX, the Virtual World Exchange for trading currencies in virtual worlds like Second Life, recently unveiled the VirWoX API. The API provides live access to real time quotes from the VirWoX marketplace, where the currency for Second Life, called Linden dollars, can be traded in several real-life currencies (see our VirWoX API profile for details). The Virtual World Exchange provides opportunities for Second Life members to buy and sell Linden dollars in U.S. dollars, Euros (EUR), UK pounds (GBP), and other currencies, potentially reducing the transaction costs for converting between real-life money and Linden dollars.
Earlier this month the Sunlight Foundation announced the winners of their Mashup Congress contest. See our earlier coverage Mashup Congress, Win Money for some background. The judges included Esther Dyson, Craig Newmark, and Jimmy Wales.