The D-List or Do Follow List is a itemize of over 200 blogs which have the ‘no follow’ unification unfit from the comments, which effectuation that if you interpret on these sites, you will intend an actual unification back to your site. The original D-list was compiled by Colleen and is currently maintained by Court at http://courtneytuttle.com/blogs-that-follow
You can get it in google SE by typing: "nofollow free" blog, and you'll get thousand of free doffollow link
thats alot trickier just type this in google "notify me of follow up comments" inurl:edu you will just have to look through them all Alot of edu blogs are "do follow"
Now this is the trick I read on some blog is to use Google image search and try the query : "u comment i follow".gif and you get some nice dofollow blogs to comment on. Be creative on these images and you will get lucky