I found a set of several user accounts that are all posting spam on superuser. I think an IP-ban or other more direct intervention may be warranted than the normal close/flag votes, and so I wanted to draw attention to it here as well.
Start with this user:
https://superuser.com/users/98224/sabio47
Check not only all his questions, but all the answers to his question and user accounts that posted those answers.
Right now I only see three accounts and 5 posts, but those are just the ones I know about and it definitely looks like the start of a pattern.