Steve Guggenheimer blogs on interop.  I love to see this!  Steve runs the global application platform business at Microsoft; his organization has responsibility for overall strategy, as well as responsibility for indvidual products and technologies like SQL Server, Visual Studio , the .NET Framework and BizTalk Server.  He talks specifically about the interop work we announced with Zend last week, and how it fits in with our ongoing efforts on interop.  Steve says:

The work on PHP adds to other interoperability work we’ve been doing along these lines. The JDBC driver for SQL Server is another great example. Our work on Silverlight is another one. The large set of application adapters we ship with BizTalk Server is another. Interop is a key area of investment for Microsoft, and we’ll continue to work hard in delivering customer value here.