Guestbook spammers

I have a guestbook (come and say g'day) and Tell J-9 has a guestbook. Tell J-9 is a webpage set up specifically to inform people like you and me about a relatively unknown, deadly form of breast cancer that is often misdiagnosed because it doesn't present with lumps.

So when guestbook spammers like sexybabes leave messages in books like Tell J-9's, my blood boils. Both books have had three in the past fortnight. Of course, the sites doing the spamming don't have any way of contacting them, as they're only there to show ads.

Imagine how you would feel if you were a woman wondering if she had terminal Inflammatory Breast Cancer (IBC) and you clicked a link to a site showing naked women? One of the spammers was a blog which I tracked down as a member of Blogarama and was able to inform the administrators, but sometimes it feels like it's a losing battle against slimy spammers. How do these bastards sleep?