check my post here at DP forums. I got a list of 50 high pr do follow blogs: http://forums.digitalpoint.com/showthread.php?t=1039914 to check if a link is dofollow or not, from firefox right click on a link in the comments. if "Relatio: Nofollow" is seen, the link is no follow. if you dont see such, then its a dofollow link. hope it helps. do let me know on the thread if you find my link useful or not, or if you want other features.
http://dofollower.com It's new and still growing the database, but all blogs added are checked by hand for dofollow status before being entered. Finally, a properly maintained dofollow search perhaps...