Backlinks from .EDU and .GOV sites are quite valuable. To get backlinks
from EDU sites, all you have to do is find forums & blogs on edu
sites. Quite a few college students & professors have their own
blog (on a edu domain). So if you are trying to acquire edu backlinks
all you have to do is post a comment on a college blog.
To find an edu blog, just do a Google search for:
site:.edu inurl:blog "post a comment"
-or-
site:.edu inurl:blog "post a comment" "your keyword here"
-or-
site:.edu inurl:blog "post a comment" -"comments closed" -"you must be logged in" "your keyword goes here"
Here's several more Google search terms:
To find EDU blogs:
site:.edu wp-admin
-or-
site:.edu comment.php
To find GOV blogs:
site:.gov wp-admin
-or-
site:.gov comment.php
Be sure to post relevant comments ... you don't want to spam the edu blogs or your comment post will get deleted.
(1) The jury is still out about whether there is added value in getting backlinks from sites in your niche (not talking about getting pass-through traffic, just the backlink value). Many many people feel this is way overrated, me being one of them.
(2) With respect to "do follow", it certainly has a value by google, but really no effect as to yahoo, etc.
(3) You briefly mentioned this sort of thing in the "hitch a ride" section, but IMHO the best and easiest way to get great quality backlinks is from putting links in your profile and forum and web 2.0 properties, where the underlying domain has a high PR. Many of us have had phenomenal success with this linkjuice.
(4) Not everyone agrees as to how much of an issue it is to get tons of backlinks quickly. Many believe that the whole Google sandbox thing is way overrated. If we are talking thousands and thousands to a new domain, then OK. but I don't think throwing a hundred of backlinks at a EZA article a day is going to do anything but help you get to the top of google.