Heres one I recently turned to DoFollow. I do moderate the comments though so anything that is just seen as spam will not be accepted. http://www.spicacasts.com
http://www.untwistedvortex.com/do-follow-commentluv-keywordluv-blog-list/ and here two great dofollow blogs http://widgetsforfree.blogspot.com http://postyourlink.blogspot.com
Are you guys only commenting on these dofollow blogs that are relevant to your niche? What if there are only about 10 good ones that you can find? Do you continually comment on them?