As we know that, Blog Commenting is important part of Seo process. Everyone is know that without back-links we can not get great results and can't achieve top ranking for site keywords. So we should try article submission, bookmarking, directory submission, forum posting and at last and most important DO Follow blog commenting for building back links. Here I'm sharing some do follow blogs for commenting.

http://hurryupharry.org/
http://www.blogussion.com/
http://freebloghelp.com/
http://eartheasy.com/blog
http://www.craigsblog.com/
http://blogger.xs4all.nl/
http://125pounds.com/
http://www.simplerandomness.com/
http://sampler.drupalgardens.com
http://www.haitiinnovation.org/
http://paratransittexas.org
http://www.flytrapgames.com/
http://www.playfire.com/
http://www.paraisophilippines.com/
http://blogcritics.org/music/
http://www.sueblimely.com/
http://blog.julielenzerkirk.com/archives
http://cooking-solutions.com/blog/
http://www.chequer-board.net/story/
http://www.open-mobile.org/news/
http://www.manyhands.com/
http://www.penseyeviewnew.com
http://www.businessweek.com
http://www.way2resources.com
http://teamnirvana.com/blog
http://www.seomoz.org/blog
http://christiandebthelp.cz.cc
http://cheaplifeinsurance.cz.cc

This is great and auto approved blog. You can try it for achieving great results.