Germany-based "business social network" XING announced this week that the XING API is now officially out of beta, and invited external developers to register for access at dev.xing.com. Since March of this year, the XING API has been available as a "closed beta," and XING reported that over three thousand developers tried out the API during that period, "creating almost 150 active apps and producing around 17 million API requests per day."
