Or just want to know how to shoot yourself in the foot?
SMB Message Signing is one of Microsoft's top support call generators, and for good reason. It mitigates valid security threats, but is very complicated to use and can have far-reaching implications on the stability and functionality of your network. To help people figure out how to use it properly I made it the topic of the September Security Management column: http://www.microsoft.com/technet/community/columns/secmgmt/sm0905.mspx.
I titled the column "How To Shoot Yourself in the Foot With Security, part 1." I have no idea how many parts there will be but as anyone who has been in the field for a while knows, there are many ways to shoot yourself in the foot with security! If you have a favorite story in particular or something you'd like me to discuss, let me know, or start comment thread here.