This past weekend I cleaned out over 120 spam bot user accounts from the forums, and deleted a huge amount of never activated accounts... well over 1000 of them. I have started banning both individual IP-numbers, ranges of them, plus certain mail domains. In this process, legitimate users might end up taking collateral damage. If that happens, get in touch on the blog or through another user and let us know.
No, I will not make public an email address where to get in touch because then that will pretty soon be spammed as well and we'll just have the same problem again. The blog is the best bet to get in touch.