Comment policy
A quick note regarding comments: your e-mail address will never be disclosed, even if you don't provide a URL. Therefore, any comment with a URL that leads nowhere will be considered spam and will be deleted before it even has a chance to appear.
Likewise, following Erik's new policy, if I want to send you an e-mail to the address you gave in the comment and it bounces at me, the comment will be deleted. I am not going to randomly send e-mail my fellow commenters, though. I only do so if I reply to your comment and think you would appreciate to receive the reply by e-mail.
These are reasonable measures I think and they are not likely to affect any legitimate comment poster.