Now here's a market. TSA-OK Multitools!

Per the TSA web site:
Allowed on your person on a plane:

Cigar Cutters (WHY??? You can't smoke on board!)
Corkscrews
Cuticle Cutters
Eyeglass Repair Tools (including screwdrivers)
Eyelash Curlers
Knitting and Crochet Needles
Knives, round-bladed butter or plastic
Lighters (WHY???? - You can't smoke on board!)
Nail Clippers
Nail Files
Safety Razors (including disposable razors)
Scissors-plastic or metal with blunt tips
Tweezers
Umbrellas (allowed in carry-on baggage once they have been inspected to ensure that prohibited items are not concealed)
Walking Canes (allowed in carry-on baggage once they have been inspected to ensure that prohibited items are not concealed)

Amazingly, wrenches and pliers are NOT allowed.