Freshlogic announces IIS2Zope, which serves Zope and Plone behind IIS using fast ISAPI action.
Those of us who want, or must, run Microsoft IIS have not until now had an elegant or efficient solution for serving Zope.
PCGI is inefficient because it launches a new process for every request. The ASP404 solution works, but it does require every request to be interpreted by the ASP engine. Further, ASP404 requires a 404 error to be triggered in IIS for every request.
IIS2Zope on the other hand, is fast and efficient. IIS2Zope uses an ISAPI interceptor to grab requests destined for Zope or Plone. Requests are then handed over to an ATL Server proxy for serving from Zope. All components are written in C++ and offer the fastest feasible technique to get that Zope content to the browser via IIS.
IIS2Zope is free.