There are almost 16000 members registered in the Forums.  Hoever, it is "difficult" to determine who are "active" members, since many will frequent the forums, look at the posts, without posting.  Are they "active", I would say so, but you can't really tell. 

Of coruse, there are many that registered, looked once or twice, then leave.  Unless they actually "unregistered", they're still "active".

If you're talking active "paid up" members, that's something that pete will have to decide to tell (plus he's the one who knows, anyway)