I've never done it before. I'm talking about this kind of service I saw posted here as a banner ad at BLACKHATWORLD. http://www.forumlinkbuilding.com/view/link_building_service?bhworldpr9 Would you recommend that? Are services like that going to make huge impact on my ranking / traffic? Or should I stick with my article marketing / scrapebox / amr / seolr / magicsubmitter efforts?