Thank you for your detailed response.

I'm still wondering if buying these keyword domains and using them for PPC landing pages would be more effective than using the company's website domain, which is already well-established and trusted but doesn't have keywords in it?

Which types of domains work better for PPC landing pages?

Does SEOmoz have an experience or knowledge in this area?

I was hoping to hear from mozzers on whether hosting PPC  landing pages on keyword domains is more effective than hosting the PPC landing pages on the main trusted domain.

Does anyone anyone at SEOmoz know?

I have a client who wants to buy a lot of long domains with keywords in them, for example, thesandiegopetstore.com (this is fictional) and then set up a PPC landing page for each. They think that when someone types in "san diego pet store" that their domain will be listed high and then they will get a lot of traffic.

My concern is that they will own a lot of domains for their company and I thought Google is getting pretty adamant about companies not having a lot of domains, and I thought that keyword domains are not as effective as they used to be -- that branding is more important now.

Also, I think the domains they've picked target very competitive keywords and that perhaps they will get a lot unqualified traffic and will still have to pay for the clicks.

What do you think?

What is the best way to set up PPC landing pages?