Take a look at this link:
http://www.microsoft.com/web/gallery/Default.aspx?sorting=latestadditions

From Microsoft:
"The Microsoft Web Platform supports interoperability of PHP applications and solutions built on Windows. Many PHP developers currently use Windows for their development environment of choice, and with the Windows Web Application Gallery, PHP developers now can choose from numerous applications and solutions, built in PHP, that run well on Windows. In addition, PHP developers can benefit from the huge community bases of ASP.NET, PHP, Microsoft Partners, and other communities out there that are committed to supporting the Windows Web Application Gallery. Microsoft is committed to helping developers, regardless of language of preference, be successful on the platform."