The system claims there are currently 16884 registered users, but I don't know that this is very meaningful. A large number of these are folks who only posted a few times, and never returned. Many of these accounts have lain dormant for over a year - we don't purge them. Some folks have registered multiple times, and many folks seem to read the forum without bothering to register at all. So an accurate count is nearly impossible. But 16884 may give you some idea at least.