Links from in Page Content are the most Powerful link
How good content can help increase your PR? Links that appear within the page content of blog that relevant to your niche are getting more weight and value to your blog than if it is found elsewhere like at the blog comment section.When it is blog comment, your link might not your target keyword and you most likely get filter out by the spam filter if you use your target keyword as a name to commenting on "dofollow" blogs .
In fact. An text link found in the page content is recognized as more natural linking and search engines have created their algorithms to give more weight to such links rather then comment section,Search engine will study the surrounding text to examine the relevancy of the link primarily because this is viewed as most natural part of quality content.
Since the search engines determine the relevancy of the topic based on the text that appear within a page(which the link appears on the page).If you having a link exchange campaign. Exchanging Link With Related Blog is very important factor to SEO.Linking in from the page that relevant to your topic will bring extremely benefit for your ranking.
Most people think that they should get more inbound links than outbound links. The truth is if you refrained completely from linking out from your blog without fair number outbound links from your post,that is known as unnatural linking.That's not good thing for Search Engine optimization. In fact linking out won't hurt your page rage if you're linking out to"good neighborhoods"It only shown that your blog is relevant to your topic that you targeted .Google might award you a good PR for that reason.
You might be interested on the weight of Links Directory Vs In page Deep Linking