I mentioned this elsewhere earlier, but if you are registering to the forums with a Gmail account, Gmail has recently decided to send all emails from these forums directly to spam. Any activation emails (or password changes) will be sent there. Please check your spam folder before registering again. Duplicate accounts will be deleted. Thank you.
And please, if you could mark your emails as "not spam" while you're at it, it would be immensely helpful. Thanks again.