According to MarketingSherpa’s Search Engine Benchmark Guide 2005/06, the U.S. search market for paid search increased from $3,3b in 2004 to $5,5b in 2005 (up 66%).
B-to-C keyword volume grew as much as 95% from 10,583 to 20,595. The top three keyword research strategies that gave the greatest ROI were:

Segmenting log files looking for highly converting […]

At Mixx Expo the Internet Advertising Bureau (IAB) and PricewaterhouseCoopers (PwC) released Internet advertising revenues covering Q2 and the first six months of 2005.
Internet advertising revenues (U.S.) for the first six months of 2005 were approximately $5.8 billion, a new record and a 26% increase over the first half of 2004. Internet advertising revenue totaled […]