Founders, what title do you use in email?
brk: You should use whatever you think your actual title is at this point in time.  "President" or "Founder" would probably work well.  For a small shop "CEO" and "VP" titles can be a little over the top.  90% of the time, this isn't an issue, but in some cases people will honestly have more of an impression of "Oh, isn't that cute!" instead of "Oh, he is is the CEO".  I guess what I'm saying is that in general you will do well with no over or understating your reality in the company.Do what you say, say what you do.