McKinsey also asked about the future of online marketing. By 2010, the Web is generally considered part of the first two stages of the buyer's decision-making process — product awareness and information gathering — for most consumers.

More than 25 percent of respondents planned to increase their e-mail spending in the next three years, but plans to increase spending on e-mails mean they may lose some budget to paid search and other tactics.

E-mail marketing is also prevalent in the United States. Nearly 73 percent of U.S. marketers in a Penton Media Custom Research study said that e-mail was one of their online and mobile tactics.

Newsletters were also popular, picked by at least 60 percent of U.S. marketers, while banner ads, online promotions and blogs still lagged behind.

More details about the e-mail marketing report can be found here.