Web site looks very nice. I don't like the bright body text though, I had to darken it with firebug so I could read it comfortably. Despite the current fashion, I can't imagine why text on a white background would ever be brighter than #444 much less #999.
What I am not that sure about is your pricing structure. I am not sure if it works as this kind of a stand-alone service. Maybe you could get existing Facebook oriented marketing service to offer it as an up-sell? Maybe some form of personal touch about you/team, or at least a "real" address in the contact section could give it more credibility.
Also I am curious: How did you get these testimonial brands?
Not so good: - Pricing. Why is it tied to fans? This seems totally arbitrary.
Possible easy fixes: - Font contrast (as previously mentioned) - Link to clients' facebook pages instead of their website. This way visitor can see how your service is being used and also legitimizes your client claims. - Examples/case studies of how your service is being used for success.
