Forum Moderators: open
But if you are refering to posting your own links just to get better ranking, then I hope the moderators ban you! If you have good, related content, others will post links to your site on the forum, and you will get traffic from them. I probably get over 1000 visitors a month from people following links poated on various forums, and I've never posted any of those links myself.
That is one reason I tend to spend more time in another webmaster forum than this one. If someone talks about a nifty tool and posts a link, I can just click the link. I don't have to guess at it or do a Google search to find it.
On the other hand, links in sigs or advertising your own site I think should definately be out.
Professional Forum Spammers [webmasterworld.com]