An Easy Way to Get .edu Back Links
Search Google for 'site:.edu Leave a Reply'. 'Leave a Reply' is the default text above comments in wordpress so this search will bring up a listing of edu sites that (most likely) have word press installed. You can leave comments on these sites to get a back link from an edu site, but it will most likely have the nofollow attribute.
If you look at the sites in the search results you'll see that a lot of people have already done this, and it's amazing to me how easily fooled these 'educated' people are that run these blogs. They are unaware that you are just trying to get a link and are easily flattered. You can use that to your advantage.