In a nutshell, getting several “.gov” and “.edu” backlinks will contribute to your PageRank tremendously, more then just a regular link, or PR6 link for that matter.
How do you get these coveted backlinks?
The first thing you want to do is find these sites that end in “.gov”, and “.edu”.
The way you do this is by going to Google and typing in any of the following into the search box:
inurl:.gov+inurl:blog
inurl:.gov+inurl:blog
inurl:.edu+inurl:forum
inurl:.edu+inurl:forum
When you type any of these into the search box in Google, the results will yield a lot of .gov and .edu sites (depending which code you typed in). Notice the codes are looking for blogs and forums that end with .gov and .edu; the reason for this is because you can comment, and place links on forums and blogs–allowing you to link back to your site.
What if they don’t follow?
Well that’s OK. For those who don’t know, follow, in this case means allow links to be indexed by search engine spiders. If a site doesn’t follow then there is pretty much nothing you can do about it. But there is a solution to all of this, and it’s called: Search Status
This should help you avoid commenting on sites that will give back no SEO juice. Saving you a lot of time. Seriously, you should definitely take the time out to search for these sites, and leave comments linking back to your site; it will improve your PageRank in due time, and can make your site more valuable if you plan on selling it one day.
