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Hi Karen, I'm one of the associates here at SEOmoz. We look at the public questions that come in and respond, endorse, and add information as needed. You tend to get more answers this way, and responses more quickly. To guarantee a response from a staff member or associate, you can ask a private question. With a private question, it may take a few days to get a response, but it will get answered by a staff or associate.

Hi Karen, SEOclient12 had some really good points, so let me just add my own 2 cents. To boil down the question to it's fundamentals, you're asking if a keyword rich domain is better for PPC campaigns is more effective than directing the ads towards a non-keyword rich domain. The easy solution is simply to amend the Display URL to include keywords. If you have the space, you can generally put whatever keywords here you want, including Dynamic Keyword Insertion. This has the usual effect of increasing your CTR, which in turn raises your quality score and lowers your cost per click. (if you aren't familiar with Keyword Insertion, it's a great technique worth checking out) This is the preferred solution and generally a lot easier than setting up unique domains for each ad. That's not to say that a unique, keyword rich domain won't help your conversion rate, but my suspicion is the benefit, if any, may not be worth the trouble. Also, if you do set up multiple domains, be careful about linking them together (or make sure to keep them out of Google's index) as too many linking domains may be interpreted as a network. Hope this helps. Best of luck with your SEO!