Visible Measures is a very cool media technology company that I have enjoyed advising since it's inception. Tomorrow they are doing a product launch and demo of their audience behavior measurement suite at DEMO'08. Visible Measures helps publishers and advertisers better understand Internet TV audience viewership with data on audience engagement, video virility, and advertising effectiveness. Like it's analog -- Neilson Ratings -- that measures conventional TV audiences, Visible Measures delivers behavioral data to video sites and content creators working with a significant amount of video content and advertising firms to measure and substantiate advertising ROI. See their demo.