The Xen Ruby Library by Geoff Garside providers an XMLRPC client library for users of the Xen API working with XenServers. The Xen API, or XAPI, gives developers tools and an interface for the remote management of virtualized guests running on a Xen-enabled host.
Heroku is at the end of its first full year as part of Salesforce.com. During that year, the number of applications running on the platform has grown eight fold to over 800,000. Byron Sebastian, Heroku's CEO, said that much of this growth has come from an increasing presence of enterprise customers, many of whom are new to the API-driven Platform-as-a-Service offering that Heroku offers.