Guilty Design Pleasures...  

Interchangeable grooming...
Interchangeable grooming tools would be perfect, brilliant DC. Lets make it ultrasonic, as I'm very pleased with the cleaning results of my ultra sonic toothbrush. Perhaps high enough frequency to reheat that morning coffee?
Swiss army, Gerber, Leatherman would be proud.
Reminds me of an epsiode of Better By Design, where the designers attempted to incorportaed ultrasonic technology into a razor.

Thanks, Hudsonhonu
Blessed are the peacemakers.