Challenges in the wider economy spilled onto the web, pushing ad rates in the US down 27% according to PubMatic. Their AdPrice Index tracked a big slump in Q3 2008, with prices down 21% from Q2 and 27% from Q1.
All categories showed drops with the exception of Technology which remained static. The report also found that ad inventory on small websites is worth over three times that of large websites, at 61 cents and 18 cents respectively.
PubMatic: http://pubmatic.com, 23/10/2008
Website AdPrice Averages by Size