What would you say is the coolest app or extension you’ve discovered in the Chrome Web Store?

+StumbleUpon is hosting a contest (http://goo.gl/hO4oj) over the next two weeks to help see what useful, unusual, and under-the-radar things you can discover in the Chrome Web Store using their extension - who’s up for the challenge?

You can get the Stumbleupon extension here: http://goo.gl/8Gjph #funfriday
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