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I searched this site and can't find any thing related to this topic. Thanks so much in advance!
For Google just run seperate campaigns for each client, Overture split your bids into different categories, similar things available at the others i'm sure.
Best to have just one account so that your real size is apparent to the company, useful for improving customer service from them(getting your own personal point of contact at overture or espotting). The odd invitation to their corporate days such as Go-Karting days doesnt go a miss too. :)