1. New registration now requires email activation. So, as it stands, you have to go through captcha AND activate via email. The problem though is that the spammers we've had were not bots but probably real people since captcha has been active for a long time now and bots can't get past captcha. But having to do email activation should slow them down by a minute or so At least it'll make it more annoying for them.
2. The recent spammers we had last night and this morning where all coming from 194.165.42.* so I have banned that subnet, hopefuly there is no one legit from there.
This should cause things to settle down for a bit until they get a new subnet.
Sorry you guys had to read that crap. Welcome to the internet