I've added another layer to the spam filtering in the guestbook. Some spam does manage to get past the kill word filter so the new trick is to look for identical entries in the database before adding an entry, even across websites. So one person may get some junk, but the next 30 attempts will be blocked as the spammer works his way through the various web sites.
The new thing in spam is to put junk in peoples guestbooks, bastards. They simply look up the term "guestbook" on google for a list of possible targets. Some of the spammers use a script that fills out the form automatically, but some are actually entered by hand usually by someone in mexico or pakistan.