The new fun game the blogspammers have adopted when plaguing my site is to create an account and try to create posts in the Eviscerati Forums. This worked for a while until I changed a few settings so that my spamcatcher could do its thing... but even though they haven't been able to break through Mollom for a few weeks, they keep registering accounts.
So today I purged a lot of spam accounts from the roles. I'm pretty sure I only purged spam accounts--their account names are rather, ah, distinctive--but it's possible I accidentally nuked some legitimate accounts as well. If that happened to you, I'm sorry. On the other hand, you might want to avoid using account names like "petergrflkmmmbtp" in the future.