NBC.com, which grew 312% month-over-month, saw the largest September increase in video viewers, followed by FOX Broadcasting and ABC.com, with 165% and 105% growth, respectively, Nielsen Online reported Thursday.

“A combination of series and season premiers, political news and parodies, and coverage of the financial crisis all contributed to increased online video viewing for the television networks in September,” Jon Gibs, vice president, media analytics, Nielsen Online, noted. “Consumers are increasingly relying on the Web to catch up on content they missed when it aired on television and the networks are beginning to capitalize on this trend.”

Total video streams in a variety of entertainment categories also increased last month.

Overall, the number of unique viewers streaming video online increased 6% — from 117,916 viewers in August to 125,061 in September.  Meanwhile, total video streams increased 10% month-over-month — from 8.06 million in August to 8.89 million in September.

YouTube, Yahoo! and Fox Interactive Media were the top brands, ranked by video streams, during September.

View the full press release.

Read coverage of Nielsen’s findings in TV Week, Media Post, and Biz Report.com.

According to research from Nielsen PreView, films featuring actors who are well-liked earned significantly higher revenues at the box office than films headlined by actors with stronger name recognition. 

In 2006 and 2007, comedy films featuring well-liked actors generated an average of $75 million in box office revenues, while those with less-liked actors earned only $44 million, on average.  In contrast, how well the actor is known made little difference at the box office.

The takeaway: films and brands that align with lesser-known, but well-regarded actors with loyal fans may see better returns than those generated by bigger celebrities.

Read Nielsen PreView’s Advertiser Handbook for more insights on entertainment media strategies.

Learn more about other recent Nielsen PreView studies on R-Ratings, 3-D films, and digital streaming video.

Despite a continued softening of the economy, several media showed healthy growth in advertising for the first half.  Advertising on Cable TV (+8.1%), Syndication TV (+7.2%), and National Sunday Supplements (+7.2%) saw the largest growth, according to Nielsen.  Spot Radio fared worst among the 19 media categories analyzed by Nielsen (-10.1%). 

Although overall Internet ad spending, when including paid search and online video advertising, was up by 11% during the first half of this year, image-based Internet advertising declined by 6% during the first half of 2008, compared to the same period in 2007.

Among specific product categories, Credit Card Services (+18.95%) and Direct Response Products (+20.48%) showed the strongest ad spending gains, while the Automotive (-.01%), Pharmaceutical (-4.76%), and Motion Picture (-4.64%) categories recorded the largest advertising declines.

The decrease in image-based Internet advertising was driven by a 27% drop in online ad spending by financial services companies, which decreased their spending from $1.5 billion in the first half of 2007 to $1.1 billion during the first two quarters of this year. 

Other industries — entertainment (+47%), automotive (+45%), and consumer goods (+32%) — showed strong increases in image-based online advertising during the first half of 2008.

View the full press release.

View Nielsen Online’s report on first half 2008 online ad spending.

Read coverage of Nielsen’s findings in Wired, Investment News, the Financial Times, Crain’s New York Business, TV Week, Broadcasting & Cable, MediaPost, The Hollywood Reporter, Adweek, and Mediaweek.