AOL announced this morning that it has entered into an agreement to buy TACODA, a behaviorally-targeting advertising firm:

TACODA, founded in 2001, employs advanced technology that enables advertisers to serve highly relevant ads based on consumers’ online behaviors. Using TACODA’s technology, AOL will be able to extend its targeting capabilities to advertisers and publishers and extend the reach of its third-party display network, currently the largest in the U.S.

The move by AOL comes amid a big reshuffling and condensing of online advertising firms that includes just about every major search company. Google, Yahoo!, Microsoft, and AOL are all in on the game. In fact, this makes how many ad firms for AOL now? Five? Six? Twenty?

I guess when AOL said they were moving to an ad-supported business - and away from their subscription model - they weren’t kidding!