The buzz in online advertising in not only around search engine marketing. Behavioral targeting plays a key role in the market, enabling advertisers to proactively reach out to a highly targeted group of consumers. A new free report ("What Comes Before Search?") by eMarketer looks at how behavioral targeting works, the relationship between search and behavioral targeting, and the challenges associated with making it effective.

eMarketer projects that, in 2005, behavioral targeting will reach $934 million and will account for 8.3% of all online advertising spending. That's compared to $627 million and 6.9% projected for this year.

You can download the report here.