Check these sites out for use in back linking strategy.
Article Directories (some aren't free; need to double-check)
- EzineArticles
- GoArticles
- Amazines
- ArticleDashboard <– not free
- ArticleBlast
- ArticleAlley
- Buzzle
- iSnare
- TheFreeLibrary
Blogs
- WordPress.com
- Tumblr.com
- LiveJounal.com
- Blogger.com
- TypePad.com
- Posterous.com
Web 2.0 sites
- Squidoo.com
- Hubpages.com
- InfoBarrel.com
- Bukisa.com