Bluetooth "Big Brother" tracks festival-goers (Reuters)
Reuters - Researchers are using Bluetooth technology to observe the meanderings of tens of thousands of festival-goers at a top European rock festival, hoping their findings will launch a new generation of tracking devices.

WATCH: The PlayStation Phone

Sony struggling as Walkman hits 30th anniversary (AP)

AP - When the Sony Walkman went on sale 30 years ago, it was shown off by a skateboarder to illustrate how the portable cassette-tape player delivered music on-the-go — a totally innovative idea back in 1979.

Wake Up, Check Your E-mail, Buy Some Weed
LA medical marijuana "collective" solicits its selection through Twitter.

Gotta Go? iPhone App Tells Moviegoers When to Pee
New app tells moviegoers when to break for the bathroom and what they missed.

Web retailers, states tussle over tax rules (AP)
AP - In a big break for online shoppers, Web retailers generally don't have to charge sales taxes in states where they lack a store or some other physical presence.