Founders, what title do you use in email?
Frocer: Depends on how you want to be perceived.  One of the most interesting article I read talked about how this founder carries 2 business cards.  When he meets prospective clients, his title on the card says "VP of Sales" so his organization seems much bigger than a 1 man shop.  But if he is meeting investors, he uses his CEO title card so he seems to be the one in control.I think this scenario would apply to you pretty well :)