http://blogs.msdn.com/b/innov8showcase/archive/2009/10/19/ribbit-for-silverlight-r4sl-deep-dive-event.aspxRibbit, a subsidiary of British Telecom, has been working with Microsoft on a project called Ribbit for Silverlight (R4SL).  R4SL is a set of drag/drop Silverlight controls that make it easy for Designers/Developers to create communications enableden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)