A new generation of mobile-phone software is helping consumers shop smarter this holiday season.

New payment start-up co-founded by Twitter co-founder Jack Dorsey

"When I'm standing next to a Prius, and it suddenly starts moving, without warning, in total silence, it can be startling. After a lifetime of standing next to car engines, I expect a whine, or rumble, or something, to accompany automotive motion. In fact, I suspect it's the anticipation of sound that will drive a trend towards EV Audio."

Handy tool for generating an RSS feed for a Twitter list