Our friend Adam from Lifehacker is really obsessed with size for some reason, often googling for "length", "width", and "visualization" terms—we assume that's how he found Sizeasy. The site lets you plug in the dimensions of the cellphone or MP3 player you've had your eye on to compare to every day objects like a matchbook, credit cards, or a deck of cards. Supremely useful to find out how much that T-Mobile MDA is going to make your pocket bulge—a lot, in case you were wondering.

Left, the iPod Shuffle compared to matches and a solid gold vanity credit card. – Jason Chen

Product Site [Sizeasy via Lifehacker]

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