Revenue from online advertising set a new record by reaching $7.9 billion during the first six months of 2006.
Revenue grew 37 percent, leaving it on target for a fourth consecutive year of growth. It is also on track to set a record for the third year in a row.
Keyword ads shown next to search results make the most money, accounting for 40 percent of revenues from January to June.
The Interactive Advertising Bureau also reported that banner display ads represented 21 percent, while classified ads made up 20 percent.
Last year, Internet ad revenue reached $12.5 billion.
Even though it has experienced explosive growth, online advertising only makes up about 5 percent of all U.S. advertising revenues.