Have you heard of Drop My Link, a great site where you can Google queries to find thousands of sites to drop your links on and create backlinks.
There is a Drop down list that displays various networks where you can add relevant links "without spamming" . These networks are:
- .edu blogs
- .gov Blogs
- Anchor Text In Comment Blogs
- Angela's Backlinks
- CommentLuv Premium Blogs
- Do Follow Comment blogs <---Good for PageRank
- Expression Engine Forums
- Hubpages - Hot Tubs
- KeywordLuv Blogs
- LiveFire Blogs
- Intense Debate Blogs
- Squidoo Lenses - Add To List
Using the Official Alexa Extension allows you to see how much traffic is going to a particular page in the Google's organic listings as seen in picture below by the blue bar. Note I used the "Do Follow Comment Blogs" Query in the Drop Down Menu.
The only thing you have to do is leave a relevant comment that correlates to the page your linking to. I like to leave at least 3-4 sentences and thank the author for the great information provided.
Dropping your link on .edu and .gov blogs are good for Authority and search engines tend to see them as more important for the accurate and abundance of information.
Last but not least the page I'm linking to should have the keywords in the page name, title, description, and content. its good to bold some of the keywords and have some internal links that correlate to those keywords.