Slideshow » 15 amazing Web apps built in 48 hours
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15 amazing Web apps built in 48 hours By Julie Bort

Winning entries from the annual Ruby on Rails coding contest.

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Photo 8 out of 15

Winner, most useful: WhatDoesThisErrorMean
The name says it all. When your computer returns a strange error message, you paste it into the site's text box and it returns an explanation.