SearchEngineLowdown points to a breakdown of Piper Jaffray analyst figures showing the search engine marketing field growing to $10 billion in 2006, then growing 35 percent in 2007, 20 percent in 2008, 22 percent in 2009 and 16 percent by the end of 2010. Piper Jaffray estimates the industry will account for $23 billion in 2010.