The free report, "What Comes Before Search?" looks at how behavioral targeting works, the relationship between search and behavioral targeting, and the challenges associated with it.

eMarketer projects that by the end of next year, behavioral targeting will reach $934 million and will account for 8.3 percent of all online advertising spending - compared to $627 million and 6.9 percent projected for this year. The report also cites a recent study by Yankelovich Partners, which found that 65 percent of people in the U.S. now feel "constantly bombarded" by advertising messages, while 59 percent feel that advertisements have very little relevance to them.