I was recently invited by one of the companies that I do business with to join their new webmaster forum. They also allow outbound one way links in the message signatures. PM me for the details.
I will trade the url of the site for two one way links to my sites and an itrader + vote. It's a major advertising site that I've been putting SEO'd ads in to get into Google's top search results. I'm guessing that they set up the webmaster forum because the ads aren't passing any PR. Thanks.