I saw this just a second ago It was just a text link, the link location looked like this: http://www.*removed*.com/*removed*.html where as google ads link locations look like this. http://pagead2.googlesyndication.com/pagead/iclk?sa=l&ai=BYcP2p... What is this?
Some pages in the forum (like the login screen for example) don't have AdSense on them, so they are just filler ads so something is there.