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We don't get much subway entertainment (aside from that homeless guy who always plays the accordion for us) so our curiosity was piqued when we came across Undersound. Though it's yet to be rolled out, Undersound is an interface you can access from your Bluetooth handheld while riding the subway. From it, you can download and upload songs, anonymously browse through other commuters' music libraries (they'll be pinged if you decide to download from them), and access info about the subway station you're currently at (we're not sure why you'd wanna do that, but, ok). The idea behind the network sounds pretty cool and it'll finally give us something to do on the train other than fall asleep on our neighbor's shoulder.

Undersound [via Gizmowatch via Coin-Op]