I've just had a tidy up of accounts here, and those that were inactive who haven't made any posts
(ie they haven't completed the email validation) have been removed. If you setup a new account in the last few days, and did not activate it immediately by clicking on the link in the email you were sent then your account may have been removed.
If this is the case, just re-register and make sure you activate your account straight away.
Cheers,
Ben.