Unfortunately I just haven't had time to totally wrap my head around all the new features coming out in the Windows VISTA security infrastructure; namely those in the firewall. One technology I'd like to look at more is the Windows Filtering Platform.
If you are interested in platform security or the firewall or anything related to these things, I would recommend checking it out.
http://www.microsoft.com/whdc/device/network/WFP.mspx
http://download.microsoft.com/download/9/8/f/98f3fe47-dfc3-4e74-92a3-088782200fe7/TWNE05008_WinHEC05.ppt
http://windowssdk.msdn.microsoft.com/en-us/library/ms686658.aspx
A good link for the new Windows SDK in general is here:
http://windowssdk.msdn.microsoft.com/en-us/library/aea8d91a-0889-4e48-ba45-91433a191e48.aspx