You should try blogs with do follow comments. But take care, you shouldn`t spam there and you have to check if there is no spam already.
You can comment on blogs which are dofollow. Also, you can submit your contents to social bookmarking sites like Digg, Humsurfer, Mixx and Mister-Wong. Article marketing on Ezinearticles, Squidoo and Hubpages will also give you free high quality backlinks as well.
Blogs is the one I am busy on at the moment but you have to make your responses worthwhile... I dont think anything is easy in this game.
Blog posting is a great way to get free related backlinks to your website, by targetting already established highly reputed blogs you can not only increase the amount of backlinks to your website but with a larger effect.
Google image search helps you to search for dofollow blogs. Since these blogs have the logo/badge of U comment I follow google image search such blogs and list it out. Check here - http://images.google.com/images?hl=en&q=U+comment+I+follow&btnG=Search+Images&gbv=2
Some of the best places are : 1. Related blogs 2. high PR free directories 3. high PR authority sites
Write good free press releases about your business and website. That is a great method to promote your website and get free backlinks and good traffic. I have one free press release website in my signature. Check it now.
start with forum signatures then move on to article marketing, 2 fool proof systems. forget the social media hype