Well, I've been around for a while too (I see I joined about the same time as you - 4 years this August! Woo!), but I'm not sure about some of the stats. I can tell you a couple, though:

- going by when PaulH has himself registered, I'm guessing the board started on about May 19th 1999
- depends on your definition of active. I'd guess there are a whole lot more lurkers than posters, but that most of them are registered.
- I'm not sure how to tell what number you are
- the 3000th user appears to be auser
- 4000 users isn't inconceivable, particularly since we now include the Karma forum, so there may be new users drawn to that