I was reading over at Webmaster World and I found this gem:
http://www.webmasterworld.com/forum5/6053.htm
The basic idea it that you can now describe certain links as link that you do not want to give credit to on your page rank. This is being designed for Bloggers, but I think this is going to have an effect on forums as well.
In the forums applicaiton that I wrote I give every user a place to link to thier own web site. Now with this tool I can regain some of the leaked PR from those pages.
Also, any link within the content of the posts on the forums could have this as well.
I think this is going to be a boom for content providers, and it will prevent spammers from trying to clog up our content with links to thier sites.
It always comes down to the fact that if you remove the incentive, people will no longer take advatage of the system. Until they can find a new way around ….