It's quite funny to see an article about ad clutter clearing on the web immediately followed by an ad. :)The actual article is here, but let me post some pertinent points:
1. web surfers are exposed to 12% fewer display-ad impressions per page view than they were a year ago (accdg to comScore) and "the economy might be the most to blame"
2. a 15% increase in ads on a page results in about a 10% decline in click-through rate
3. "As you increase clutter, the message is less likely to be conveyed."
