If you're referring to the banner ads which appear in this forum, then they're there as a small compensation to me for keeping the site running. If they are objectionable, then use an ad blocker. The ads have always been present on the forum, however as it was upgraded to a new version, I had to use different plugin for placing them and they may therefore be a little different.
On a side note, the forum is not meant as a personal blog, or even a place where you should be soliciting donations or advertising, per the
http://nostradamus.org/f/agreement.txt that new registrants agree to. There are numerous blog / feed like sites where you can control the layout and content. You could also pay a hosting company run and control every aspect of the experience, including the placement of ads.
