eMarketer reports that online ad spending is projected to grow by nearly 20 percent, while other ad budgets decrease.

The research firm evaluated a survey of advertisers who control $6.5 billion in spending projects. The "Annual Ad Spending Study 2007," from Outsell, found that the print and broadcast shares of U.S. ad budgets will continue to decline in 2007, while the online ad share grows. The survey shows that U.S. companies plan to increase their online spending by 18 percent this year, more than for any other major media type.

Search is where most of the dollars will go, with advertisers planning to raise search engine advertising by 39 percent, the greatest increase of any online media method.

However, the pay-per-click share of online ad spend is expected to fall slightly, by approximately one percent, due, mainly, to click fraud concerns.

Read Kevin Ryan's In Focus article to learn more about combating click fraud.