IIS7 modules vs. IIS6 ISAPI: Managing request state in your module
For post #4 in the IIS7 Modules vs. IIS6 ISAPI series, let's take a look at another common pattern in IIS module development - storing request-specific state inside your module.
Read more at http://mvolo.com/blogs/serverside/archive/2006/12/25/Managing-request-state-in-your-IIS7-module.aspx.