A couple of good buddies of mine, Jesper M. Johansson & Steve Riley, have written an excellent book, "Protect Your Windows Network: From Perimeter to Data" which should be available late May '05.
You can read more here http://www.awprofessional.com/title/0321336437
Also, if you pre-order with this promo code: JJSR6437 you get a discount :)
They have also excerpted a portion of the book in two columns on TechNet outlining some common security myths. In the authors' style, the ideas are serious, and should be taken seriously, but they are somewhat tongue-in-cheek too!