Microsoft has delivered multiple technologies that focus on interoperability with non-Microsoft and Open Source technologies. In this video you will learn how to use the Eclipse tools today to build Silverlight applications that run on PCs and Macs, how to develop using combinations of Java, Ruby and PHP in addition to the standard Microsoft languages, and how Microsoft’s commitment to openness with the Azure Services Platform and the use of claims-based identity supports heterogeneous identity systems.

Giles Davies and Richard Erwin explain how to work in a mixed development environment containing .NET and Java projects by using Team Foundation Server to manage the process, source code, versioning, tracking, building, and reporting and using Visual Studio and Eclipse as IDEs.
http://www.infoq.com/presentations/Mixed-Java-.Net-Projects-Giles-Davies-Richard-Erwin

The Eclipse tools for Silverlight project, aka eclipse4SL, is an eclipse plug-in that enables Eclipse developers to use the Eclipse IDE to create applications that run on the Microsoft Silverlight runtime platform. The interoperability scenarios this project enables are very interesting, as it provides more choices to Java/Eclipse developers and opens up new opportunities for Silverlight adoption. This demo gives an overview of the developer experience of creating a basic Silverlight application in Eclipse, shows how collaborating with a designer could work, and gives a sample Silverlight application talking to …