Take the i-Pod Shuffle idea and offer a stream of brain teasers and trivia. The pitch: Entertaining way to sharper your brain. Might be a Jeopardy! version. Or stuff from almanacs and encyclopedias. Games Magazine. Samples from various popular games, such as Scrabble. Tests with word problems from math books. Tricky lateral thinking problems from such as Mind Trap. ID the voices, the songs. Could have Cultural Literacy bits, with famous quotes, speeches, passages from novels, plays and poetry. Hey, include some creativity tips from stealmyideasplease.com. If it keeps switching around as fast as a soap opera, could it stay be an interesting listen at the gym, on the jog, in the car? Or is this geeky optimism?