Have people been getting the activation email? Every once in a while I go in to check and see if there are any users that registered but didn't activate. Every registration should be getting an email that confirms your information was received, and then you need to click on a link to verify that the email was valid to try and keep the spammers away. A pretty standard thing when joining a forum. I suspect the activation email may be hitting the spam filters in some email hosts, not much I can do about that.
As of right now, everyone that registered is activated, only two users I'm not familiar with at this point.
If anyone doesn't get the activation email, please use the contact form, it seems to work every time I test it.