We're living in the golden age of the gadget. Don't believe it? Check your pockets. Odds are you're carrying a portable music player, an electronic organizer, a keychain-size storage device, a digital camera, or a cell phone that combines some or all of these functions. And you'd probably be hard-pressed to live without them.

We're living in the golden age of the gadget. Don't believe it? Check your pockets. Odds are you're carrying a portable music player, an electronic organizer, a keychain-size storage device, a digital camera, or a cell phone that combines some or all of these functions. And you'd probably be hard-pressed to live without them.

1. Sony Walkman TPS-L2 (1979)

Portable music players are so cheap and ubiquitous today that it's hard to remember when they were luxury items, widely coveted and often stolen. But when the blue and silver Walkman debuted in 1979, no one had ever seen anything quite like it. The $200 player virtually invented the concept of "personal electronics."

The first Walkman (also branded as the Stowaway, the Soundabout, and the Freestyle before the current name stuck) featured a cassette player and the world's first lightweight headphones. Apparently fearful that consumers would consider the Walkman too antisocial, Sony built the first units with two headphone jacks so you could share music with a friend. The company later dropped this feature. Now, more than 25 years and some 330 million units later, nobody wonders why you're walking down the street with headphones on. Learn more in Sony's history of the Walkman.

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