SUMMARY: Last week the Internet Advertising Bureau announced that January-June 2001 online ad sales were down 7.8% compared to last year. We took a closer look at those numbers (including some numbers the other media don't have yet) . and then we interviewed 18 online media brokers and sales reps to find out what's changed since June 30th. In other words: what's really selling right now. Before you read this free report, here's a quick glossary:
- IAB - Internet Advertising Bureau;
- CPM - cost per thousand (how web sites want you to pay for ads);
- CPA - cost per acquisition...