This backlink will increase your link popularity and hopefully will increase your Pagerank.

http://robotics.nasa.gov/rcc/redirect.php?url=%2F%2Fwww.g33kworld.com

Just change the www.g33kworld.com to your domain name.
Enjoy.

That’s right how to do it? easy, and of course it’s free, let me straight to the point, some of .edu blog allowing you to sign up and let you create a sub directory .edu blog, by using this google search query:

“powered by WordPress MU” inurl:.edu

you will see results hundreds of .edu wordpress blog, just go to sign up page and register yourself for a blog.

Some of blog i’ve found is:

http://blogs.slis.ua.edu/slis/blogs/wordpressmu-1.0/wp-signup.php

http://clove.edschool.virginia.edu/wordpressmu/wp-signup.php