The ad market for high-end online video such as joint NBC Universal-News Corp venture Hulu.com is slowing up -- the site was sold out as recently as August but this is no longer the case according to this report. Research firm eMarketer is still predicting 45% growth in spending by U.S. marketers on online video advertising in 2009. One challenge marketers face is the absence of a single standard -- meaning many advertisers need to tailor technical specifications to individual sites.

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