I have a tool set up here that's supposed to run every registration past a massive database of known spammers, but it seemed to have been acting up. Fixed now, though, and I ran through the member list and banned every spam account I could find which had been registered in the meantime. This shouldn't be an issue anymore.
If, perchance, you happen to find any spam or spammers around the forums still, please report them using the report button on their posts.