Surprised no one mentioned this: What do you make of the "Blu Streak" written on the right fist in that picture?
Edit: Just found this one: http://www.teamfortress.com/engineerupdate/evolutionaryman/ . It's right under the blueprint for the wrangler, on the right side. Just mouse along just under the border of the right page of the blueprint, the one that describes the shield, and you'll find it. Sorry if someone posted that one already.