There are only a few basic link strategies that will work long term. Playing outside of this is asking for trouble.
Articles.
Press Releases
Social Bookmarking
Link Bait (used with social bookmarking)
Articles are the best long term solution. Learn more here.
Article Marketing and SEO. The Super Advantages of Articles
Press releases will gain instant traffic but are expensive. Social bookmarking is good, but limited for long term.
link bait is part of social bookmarking But can bring instant and massive traffic in the short term.
Articles are the most cost effective and long term solution for now. Buying links is a dangerous game, and now it seems that recips are on Matt Cutts hit list.
Do it right the first time, no shortcuts and you never have to worry about algorithmn changes.