Backlinks is one of the most important aspect of SEO (Search Engine Optimization), the more backlinks to your site will raise your site ranking, here is list of site that offer free links:

PR3 http://yourwebsiteprofit.blogspot.com/
PR3 http://chrishoyt.com/
PR3 http://bloggersjourney.com/
PR3 http://silkenhut.com
PR3 http://blog.vinceliu.com/
PR3 http://www.ericbramlett.com/blog/
PR3 http://www.themadhat.com/
PR3 http://www.jakobdk.com/
PR3 http://www.brilliantcheers.co.uk/
PR3 http://www.feelingflirty.com/
PR3 http://www.triathlontraining.us/
PR3 http://www.reviewerofsites.com/
PR3 http://www.thedailyfuzz.com/
PR3 http://www.hughhollowell.net/blog/
PR3 http://www.ebayhabit.com/
PR3 http://distressedderma.com/
PR3 http://www.zr5.net/
PR3 http://www.digitaluktv.com/
PR3 http://www.nice4rice.com/
PR3 http://blogaboutmoneyonline.blogspot.com/
PR3 http://www.lifeintherough.com/
PR3 http://www.zenzoomie.com/
PR3 http://myopinionsareimportant.com/
PR3 http://www.biggerpockets.com/renewsblog/