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Online shopping and purchase evaluation continue to grow right along with online advertising. Here is an excerpt from a look at Q3's online ad marketplace.

"We continue to see robust growth in the online advertising sector," said Aaron Kessler, a senior research analyst at Piper Jaffray & Co. The investment firm estimates Internet ad growth of about 30 percent during the third quarter, roughly on par with quarterly gains during the first half of the year.

Other Internet analysts weren't as overwhelmingly bullish as Kessler, but were still positive. They predict that online ad growth for the third quarter would cool slightly to the mid-20 percent range from the torrid pace of 30 percent or more during the first half of the year and 2005. That slight softening reflects a projected slowdown in overall ad spending due to a weakening economy.

A research report issued by Merrill Lynch analyst Lauren Rich Fine Wednesday reduced the estimate for overall U.S. ad spending growth to 4.7 percent from 5.1 percent in 2006. But it described the Internet as "the bright spot" within its downgraded overall advertising outlook. Merrill Lynch estimates Internet ad growth of 26.2 percent and 27.4 percent, respectively, for the third and fourth quarters.

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