GettaGrip Musclephone

"Forty seconds' vigorous squeezing of the GettaGrip Musclephone gives a full recharge of the lithium-ion battery. That's 20 seconds per hand. No more scrabbling around for a recharger. No more rationing calls because the battery is getting low. And all the while developing a grip like a gorilla."

[via James Ferguson's "Pat Pending" feature in the December 12, 2008 Financial Times "How To Spend It" magazine]