I was celebrating my http://iislogs.com server has been up for 100 days by geeking on HTTP Modules / HTTP Handlers.  I'm still working through my HTTP module / handlers.  Once I have the code finished, I'll post up.  I found some good links for this topic.  Enjoy

ASP.NET Application Life Cycle Overview  (Nice graph of all events)
http://msdn2.microsoft.com/en-us/library/ms178473.aspx

Introduction to HTTP Handlers 
http://msdn2.microsoft.com/en-us/library/ms227675.aspx

Introduction to HTTP Modules 
http://msdn2.microsoft.com/en-us/library/ms178468.aspx

Custom ASP.NET Processing with HTTP Handlers 
http://msdn2.microsoft.com/en-us/library/5c67a8bd.aspx

ASP.NET 2.0 Internals 
http://msdn2.microsoft.com/en-us/library/ms379581(VS.80).aspx

'List global modules
appcmd list config -section:globalModules

'List modules
appcmd list config -section:httpModules

'List http handlers
appcmd list config -section:httpHandlers

The first 100 days of IIS7