I have been a member of the SEOmoz community for about a year, and I am currently searching for an SEO/SEM to help me go from about 80,000 US visitors to about 200,000 US visitors per month.   My frustration with looking at resumes and with contacting people is that there is no way for me to tell who is capable of achieving that type of growth. Since I have not ever hired out an SEO/SEM, I have no clue what to offer the (right) candidate. 

I'm going to vent for a second... I think it might help SEOmoz understand where an employers frustrations lay:

1. You have to give up a lot of proprietary information and trade secrets to give an SEO full reign of your site (which doesn't feel good)
   
2. How much do you pay a good SEO? (This is a very important question for both parties)
   
3. How do you measure an SEO's effectiveness (most SEOs I have spoken to [albeit years ago] hide behind the "It takes 6 months to see results" cloak)
   
4. What role does the employer have in providing the SEO with resources outside of pay to harbor the most success?
   

Do you have any suggestions? 

Cheers, Milan