Why you shouldn't do linking schemes... you can get banned.
Many people feel that the quickest way to jump your rankings is to build links. And though it is important to have as many "quality" links as you can get, the search engines know which are which.
The best way to build popularity back to your site is naturally. How do you do this? Time. SEO (or online marketing) is never a race, it is always about providing searchers with the most quality result to what they are searching for.