Guestbook spam

I think I finally figured out how to avoid a big chunk of the spam that was invading the guest book. Previously, I would have upwards of 5-10 spammed comments in the guestbook every day. I could rename the guestbook, but it would be found again within days. My solution? I renamed the guest book, and then changed the link. Instead of linking from the word "guestbook", I am now linking to the word "here" (as in, click here to sign the guestbook). So far its working; hopefully it'll stay that way!