Oh, I gotcha. The only way to tell, really, is to watch the front page with the "Total Members" and see who is listed as the "Newest Member" when a particular landmark rolls by.
The members are listed chronologically under the "Members" section, but are not numbered. If you wanted to know, I guess you could count them...
The number is also slightly subject to change because it goes down on the very rare occasions that I delete a duplicate entry or boot someone out.
Anyway -- that answers the question as best I can.
