any thoughts?

you should go for it as long as it is a "do follow" link.

Some websites have the same link in all pages of the site (ie, the footer), which means the number of links will be the same as the number of pages.

If its a dofollow, do it, why not.

best way to find out is to vie the "source" code of the website.

[DELETED]

even if your links from a gov-edu sites does not have your keyword as anchor text it still gets good link juice as long as its from edu-gov

Look, i've been hearing about the "dofollow" and "nofollow" stuff for a while now. Maybe it's just me, but i think link building isn't that trivial. It's not just about building as many dofollow links. I believe Google isn't that stupid.

Somewhere in the WSO section is a product called "Edu annihilation" and i asked the author whether nofollow edu/gov blogs bring some value.

He answered "Yes, i had websites high ranked by "nofollow" links only". Then I asked a Warrior Forum member (who owns a SEO company) the same question and he confirmed that "nofollow" edu/gov links are valuable. So i would recommend you don't believe anything a warrior says unless:

1) His opinion is based on facts or some research
2) He is a trustworthy expert

In general, if you have a quality website that you can leave comments on, I try to leave a few comments on different posts. There are a few reasons for this.

First, it improves your odds that at least one of your comments will be approved (although you should leave good comments in the first place so this shouldn't be an issue)

Second, it improves the odds that at least one of them will get indexed.

Third, if you want, you use some of the comments for internal linking purposes.