As no-follow links don't pass any link juice (neither the Page-Rank nor the Anchor Text), thus the high PR do-follow backlinks are the wheel-power of Search engine optimization (SEO). Definitely, I have discussed about some link building mistakes, and also, there's another kind of link building trick that you do know but you care less! The Out-Bound links from a page really matters, and in fact, it has a mass effect on your blog pages' Page-Rank. As it is mentioned by Matt Cutts' that, the pages get crawled by google is roughly proportionate to your Page-Rank, hence, you must look at the link juice that the do-follow link will pass to your page and it's passed page-rank too. Finally, we must not get do-follow links from highly spammed pages or a page with above 200 out-bound links.