Todd Teresi has announced over at Yodel Anecdotal that Yahoo! will acquire online global ad network BlueLithium for about $300 million in cash.

According to the announcement, BlueLithium is the fifth largest ad network in the United States and the second largest in the United Kingdom with 145 million unique visitors per month.

Teresi describes the acquisition of this company with over 100 employees as important for making Yahoo! “one of the world’s leading online display ad networks.” Apparently, Yahoo! believes that BlueLithium’s data analytics and behavioral targeting tools will help them get there.

Yahoo!’s acquisition of the company comes less than 5 months after Google acquired DoubleClick and less than 4 months after Microsoft acquired aQuantive, albeit for much larger sums ($3.1 and $6 billion respectively).

BlueLithium was founded in 2004 and named 2006 Innovator of the Year by AlwaysOn. Details are available in Yahoo!’s official press release.

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This is the second recent acquisition announcement for Hearst Interactive Media - UGO for around $100 million last month, and tonight they are announcing the acquisition of Kaboodle, a social shopping service that launched in late 2005.

Kaboodle, founded by Manish Chandra, Keiron McCammon, Chetan Pungaliya, closed a key distribution deal with eBay a year ago. Comscore numbers show rapid growth, with 2 million or so unique monthly visitors currently.

The acquisition price is not being disclosed, but we’re hearing it was somewhere between $30 - $40 million, all cash. The company raised three rounds of financing totaling $5 million from Shea Ventures, Kanwal Rekhi, Jeff Clavier, Ron Conway, Garage Ventures, Georges Harik, Rajeev Motwani, Iggy Fanlo and others.

One other thing we’ve heard - investor Ron Conway was “instrumental” in putting this deal together.

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