I haven't heard of any of these except Auto-Tune the News.

Based on your feedback, we’ve tweaked the formula just a tad (the full criteria is listed below), with September’s data showing an even more entertaining and diverse top 10. Our top four performers did remarkably well, with the 4th place show, Auto-Tune The News, cracking the 10 million monthly views milestone. It’s in strong company alongside 3rd place Smosh, 2nd place The Station, and 1st place Fred.

http://mashable.com/2009/10/15/sept-web-tv-chart/