I don't know what "type" of particular audience either would have. I would guess they're both the same, people searching for something.
I do know that Overture does far better for our site than Google does. We actually start losing traffic when we just have Google PPC active. Then when we switch back to Overture we get a huge jump in traffic and paying customers. Google is great if your site ranks high in the free listings but Overture is the best PPC for getting paying customers.
bye
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