For any organisation, Phalanger represents an open door to the open source application world.
It's compiles a PHP based application (complete with PHP itself) to a small set of DLL assemblies. This means that you dont have to have PHP on your server to run the most complex PHP applications. You just need the .NET framework.
PHPbb, one of the most ubiquitous discussion board systems for example, can potentially be compiled using Phalanger and run on any .NET based server. .NET developers need not retrain in PHP just to get the forum up and running.
Similarly, any PHP developer can compile their code using Phalanger - and sell their applications as 'shrink-wrapped' .NET software - opening up an entire market of potential customers. So all those PHP developers looking to deploy .NET applications needn't re-skill at all.
If your a PHP devloper OR a .NET developer - download and have a look at Phalanger.