JoeUser is a bit schizophrenic in its layout. The default posting of articles is both on a personal blog and in the JU public forums (and sometimes other possibly reltated forums, to the consternation of those forums' regulars). While this gets the information a wider audience (I have, what, 4 regular readers?), it seems to have some drawbacks as well.
I believe others have noted this, but the "Blacklist" function seems to block only comments on the "blog" side of JU. Blacklisted users can still post via the Forums. (I first recall seeing mention of this by little whip and may have just experienced it for myself.) Now, the JU forums are a public forum, yes... but this makes the Blacklist function basically meaningless unless one restricts oneself from forum posting their blog.
I believe many people who blog here feel that the forums are merely an extension of the blog-space of JU; I do, anyway. I don't make "forum posts" here, I make blog entries. They just happen to show up in the format of a forum for interface purposes... Perhaps this view is skewed and I should reasses.
But I'm unconvinced that forum replies getting around a Blacklist is an intended feature of the forum layout.