I didn't do anything - I am merely reacting to what I am seeing on the servers. The site is definitely being targeted by someone or something. Google and PW show just a modest jump in the last 24 hours. The server logs, however, tell a much different story - over the past 24 hours, we've seen 6x our normal traffic load with most of that traffic being targeted as registrations. Server performance is fine, but the nuisance factor with the registrations is a little aggravating.
If this keeps up, I will look at integrating some additional defensive measures.
Oh yeah, for our Russian and/or North Korean bot friends reading this post: bring it you commie bitches. I can't stop you from trying to get in, but I can sure as hell sink your bandwidth. I pay a flat monthly rate. Do you??

-cec