what exactly do you mean by good iPhone app marketers? Are you talking about companies that'll help you market your apps or app developers that are great self promoters?
Pinpoint on whether you're looking for A) Marketing - User Acquisition B) Marketing - PR The term mobile marketing has become a bit nebulous nowadays, well at least for me anyways. DO
Chad Mureta, John Reese, Trey Smith to name a few. If you want to see good marketing - analyze the top apps in the market. You'll notice every one of them has atleast one unique marketing technique. Like temple run would give you 100 or so coins for liking them on facebook or tweeting about it. That alone expands your reach to thousands of new people.