Hiya Forbes. I'm not sure if this is the cause, but I noticed there are 404 errors in your website.

For example, I navigated to this page:
http://blogs.forbes.com/davidewalt/2011/02/14/how-to-get-started-with-dungeons-and-dragons/

And then tried to link to the Arts and Entertainment category down at the "Related Streams" area.
http://www.forbes.com/arts-entertainment

And got this error:
"Something's gone awry! The page you requested could not be found"

But I haven't been able to find anything that looks like paid links, and I'm trying to be extra skeptical.