I think scouting-type badges for adults is a good idea. Lots of people unfortunately just didn't have parents that knew beans about certain things.
My dad, for instance, practically instilled in me that you should hire a professional for each and every situation...he didn't even trust himself to change the flashlight batteries. I'm not quite so helpless (thanks to my mom), but there are lots of things that I've had to messily figure out for myself.
Badges might include:
Negotiating for a raise
Having a yard sale
Programming the TIVO/VCR/DVR
Changing your oil
Locating the main water shut off valve (hee..funny story....)
It would be fun don't you think? Badges. Sashes. Classes. Field trips. Uniforms.
What should the top scouting rank be called? The Grown-up? The Huxtable?