The great eyeball chase is back in full swing. And it does not matter that the eyeballs may not be buying anything. With online advertising revenues growing quickly, new information-rich sites of all kinds are mushrooming across the Web.

Sites devoted to big-ticket purchases — particularly cars, real estate and travel — are feverishly refining features and marketing strategies in an effort to attract the growing number of consumers searching the Web for buying advice. Unlike sites like Amazon.com, they do not actually sell any products, but they make a good living selling ads to deep-pocketed companies that do.

And a growing lineup of deep-pocketed advertisers are looking for those consumers.

"It's a good time to be a publisher online," said Carrie A. Johnson, an analyst with Forrester Research. "There's a ridiculous thirst for advertising" on the Internet, she said. Online merchants paid 33 percent more for advertising last year than the year before, Ms. Johnson said, with costs expected to rise further.

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