There should be an easy way to tag a post, thread, or user, as spam, with a comment, to bring it to moderators' attention. As it is, there seems to be no way at all to do that other than finding a moderator to PM, which is inefficient.

At the very least... with zero extra development effort, we could maybe set up a thread where people can post to report spam posts/threads/users, that moderators should review regularly.

I nominate this thread.

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And I start by pointing out this user: http://bitcointalk.org/index.php?action=profile;u=3108
he seems to have just registered and posted some inane posts, just to get some links in his sig pointing to some hyip stuff out there.

Other SMF forums I'm on have a "Report to Moderator" button in the lower right corner of each posts. That can be turned on and off by the admin, so they could easily provide what you are looking for if they want to.