ubiquity-validate
This plug-in allows you to validate HTML and CSS of the current webpage on-the-fly using the W3C validation engine and the Firefox plugin called Ubiquity.  You can download Ubiquity here.  Once installed, you can simply goto command mode (alt-space by default) and type either: 'validate-html' or 'validate-css'.
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posted:
10:54 AM 02/01/2012
#Infographic - Increase Click-Through Rates For Your #Tweets: http://t.co/c3HoLK6W via @rww @mrpatrick
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Within a year and a half from re-launch, the new Discover.com more than fully represents the look and feel of the magazine and with the influx of new subscribers, the site will more than pay for itself.

Joseph McLaughlin, Associate Circulation Director Discover Magazine