Articles, Social bookmarking or Web directory

Article submissions is my favorite hands down, not because i sell those services, rather i sell those services only being the reason that this is the only form of advertising or backlink building where you are not spamming the hell out of some sites like blog commenting or profile link building, here you are also providing content to the network and if it stands out from the crowd the chances are that those links even get clicked by visitors notwithstanding it has already been counted towards backlink by G, so here it is of double benefit.