Even if you don't know Richard Dixon (Senior Systems Engineer on the System Center team for Network Access Protection), you couldn't miss him at MMS 2008.
He was the one wearing the cool, pimped-out Microsoft IT NAP hat.

Richard had this hat made on his own, but from what I'm hearing, you may see this hat in the SWAG list for MMS 2009.
I believe Richard is going to blog about this soon to give you the entire story, along with why it can only be worn backwards (as shown in the picture).