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
What they're saying

Our experience with the team from Avatar was professionalism from beginning to end. The project was well managed and executed and has given our web presence much needed freshness and utility.

Dan Rubin, Interactive Director The Reading and Writing Project