Jcx.Software Corp have a beta version of VS.Php. VS.Php is a plug in for Visual Studio .Net 2003 that allows to build php applications. It provides all the key components of other languages supported by Visual Studio .Net like syntax coloring and checking, intellisense, integrated help and much more.
VS.Php integrates Php into Visual Studio .Net 2003. The Php ide provide all the features of the best IDE in the world to the Php developers.
Learn more here