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Forbes takes a look at the growing trend of vertical search engines. Oodle, Jobster, and LookSmart are among the many featured in the story.

The biggest challenge for vertical search engines?

"With vertical search, by definition, you need to go to one engine for jobs, another for travel, and another for business supplies," said Rosenberg. "I think the results at these vertical search engines have to be significantly superior to Google and Yahoo! for consumers to overcome that inconvenience."

Andy Beal is an internet marketing consultant and considered one of the world's most respected and interactive search engine marketing experts. Andy has worked with many Fortune 1000 companies such as Motorola, CitiFinancial, Lowes, Alaska Air, DeWALT, NBC and Experian.

You can read his internet marketing blog at Marketing Pilgrim and reach him at andy.beal@gmail.com.