Promiscuous iPod Users? (Jack Sharing)

The process involves iPod strangers allowing each other to listen to each other's iPods to expose themselves to new music. Wired describes one user's "first time":

Crandall was boldly approached by another iPod user, a 30ish woman bopping enthusiastically to some high-energy tune. "She walked right up to me and got within my comfort field," Crandall stammered. "I was taken aback. She pulled out the earbuds on her iPod and indicated the jack with her eyes." Warily unplugging his own earbuds, Crandall gingerly plugged them into the woman's iPod, and was greeted by a rush of techno.

Crandall goes on to describe repeating the interaction with others on his routine evening walks.