Large video advertising network Tremor Media announced that it raised $18 million in a third round of funding so that it can invest in other video technologies, like video ad monetization platform Acudeo. Earlier this month, the New York-based company sealed a deal with web monitor comScore to provide gross rating points for online videos (just like TV commercials). According to comScore, Tremor is the fourth largest aggregator of streaming video on the web behind YouTube, MySpace and Yahoo.

Meritech Capital Partners led the recent round, which also included Canaan Partners, Masthead Venture Partners and European Founders Fund. Its last round of funding in 2007 amounted to $11 million.