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That's scary! I'm currently protecting parts of my site with three layers: GIJoe's XoopsProtector v.3 (I've set it to discard any post with more than 2 URLs), Richard Virtue's
Netquery which checks everything with Bad Behavior (well formedness of HTML requests and some other tests), plus a semantic check against Akismet (link to our discussion of it a few posts above). Incredibly enough, there're still submissions making their way through! They're, of course, pretty truncated an sometimes don't even point anywhere. All the more annoying. That's not even spam, that's just garbage.
I had actually hoped to shore things up with Captchas should it become necessary. It's a hassle for legit users, though.
www.affvu.org