IIS7 modules vs. IIS6 ISAPI (Reason #10): C++ Class-based encapsulation model
The first post in the IIS6 ISAPI vs IIS7 module development series. This one is about the basics, and why they make such a big difference.
Read more here - http://mvolo.com/2006/10/07/why-iis7-module-is-better-then-iis6-isapi---reason-10-c-classbased-encapsulated-model-vs-cstyle-static-functions.aspx.