By reading my console Google for one of my sites, I realized that the homepage is greatly linkée but a ridiculously low number of internal pages have incoming BL. Do you have a technical or specific reference to internal links to your site? Most of the time, directories require links to the home page or a "great" category of the site, what I want is rather a means to have deep links!
deep linking is a vital part of backlinking process. you should consider some of the web 2.0 sites that allow deep links
Find sites that allow deep links, ask some blogers to write review of your site for the category you want to promote, ask people to add your link in related link lists...
You can find many blogs that are do-follow in the Link Development section. With those, try finding sites that are going to allow deep back-links. Once that's done, you should be fine. hard work, Yugo