DanAbbamont - 12:52 pm on Apr 6, 2011 (gmt 0)
This very question looks to me against G's politics from the start. Google says links should come naturally, and not be built.
People really misunderstand this concept. You're not supposed to "place" links for the sake of their juice, but you can definitely market your links for the sake of building awareness, which will attract natural links.
Ethical Example - Create excellent content. Submit to reddit. Get X upvotes. People blog it, tweet it, post to facebook, etc. You receive ranking benefit because actual people vouched for your content.
Unethical Example - Create decent content. Submit to 100 social bookmarking sites, 100 directories, syndicate hundreds of articles on directories, etc. You receive ranking benefit because you vouched for your own content on hundreds of different sites.