We just announced the Go Live release of FastCGI for IIS5.1/6 - how cool is that!
This means the fully scalable production CGI environments can be run on the windows platform giving everyone the ability to deploy all sorts of applications.
Check out the full details
Can't wait for IIS7 where FastCGI is a module that comes as part of the server out of the box! But don't wait for that, try IIS7 out today.
Here is how to deploy this to support PHP on IIS5.1/6.0