The frantic attempts at HTTP Referrer spamming are getting ridiculous. I added the HTTP Referrer block on the side and end up with mobs of spammers wetting themselves with excitement at the thought that they might be able to get some free advertising for their crappy web site or "product" that no one wants.

I'm pretty sure the spammers are getting stupider as well. If there was, say, one spam attempt per hour, I probably wouldn't notice it, but when you get idiots like the one at 82.222.180.53 who spam every 15 seconds, it's pretty hard not to see it and add them to your .htaccess file thus:

order allow,deny
deny from 82.222.180.53
deny from 66.230.151.210
allow from all

I suppose if it gets out of hand, I'll just remove the Referrer block.

Recommended (if you're having problems with the spamming geniuses):

Bad Behavior - a set of PHP scripts that does a pretty good job of blocking spammers based on profiles of known spambots.