Windows Filtering Platform (WFP) user mode examples

So far, in Windows 2000/XP/2003 operating systems the packet filtering APIs (PfXxx APIs) were used to implement TCP/IP packet filtering applications and firewalls. However, these PfXxx APIs are discontinued in Windows Vista/2008! But, Vista contains a completely new filtering engine called Windows Filtering Platform (WFP). The WFP gives various APIs using which packet filtering can be achieved. I thought of writing a simple class which encapsulates these APIs. It might help if you are planning to use WFP APIs. The article can be found here. That article is just a starting point, and you can do much more things with WFP. These are some of the pages which give information about WFP:
WFP Management API Reference
WFP structures Reference
Windows SDK 2008
Visual Studio 2008