Nintendo Game Boy (1989)

 In the old days, kids couldn't wait till they were old enough to get their first two-wheeler. Now they yearn for their first Game Boy. The original handheld, as shown at CyberiaPC.com, featured a black-and-green LCD and a slot for matchbook-size game cartridges. Later versions became smaller and more powerful but maintained backward compatibility with the original, so you could take your favorite games with you as you grew. The Game Boy's lock on the handheld game market remained virtually unchallenged--at least until the Sony PlayStation Portable arrived this year.