When Guido and I met in Vegas for Windows Connections, he brought me an autographed copy of his new book "Microsoft Windows Security Fundamentals" that he co-authored with Jan deClerq. Guido and Jan's book is the most complete handling of Windows security that I've seen. It covers everything from security infrastructure, to trusts , to Kerberos and NTLM, to IIS and browser security, to federation and SSO. And this is only the first in a 2-part series!
I even got a shout out in the acknowledgements, and one of my quotes ended up on the back cover, too. Man, I'm feeling like a celebrity now!
Check it at Amazon.