I get lots of registration requests for the forum from spammers and so forth.
If you want to register, please don't use a username that clearly looks spammish (like "viagradeals4u" or "abcd1234"), or there's a chance I won't bother emailing you to activate your account!
(Of course, any intelligent spammers reading this will now know what to do, but I'm assuming they don't bother to read posts).