Do you mean how many paying members of CuteEmbroidery.com are there? Or do you mean how many people have an account (free or paid, either way)? Or do you mean how many people come to see this forum? As Jrob says, you could ask at firstname.lastname@example.org about either of the former, and I doubt that there is any accurate way to count the latter. All we really have to go on there is how many people have actually posted, and I can almost guarantee that there are a lot more people who read but never post anything. =]
you would have to ask that question of: email@example.com. She could tell you how many paid members there are, but Otherwise I guess you could count unique "hits" to the site.
oh - my - I have never heard of unique "hits" to the site - what is that?