I find most of blogs add nofollow tags. It's very different to find no-follow blogs even with software. The on-follow blogs which software find are just new blogs nobody post any comment. So software cann't find no-follow tags.
Just start searching. There are a few blogs that are out there that are pr5+ with dofollow... but they are hard to find. Just keep searching. With link development, finding that GREAT free link source (such as a PR5+ dofollow blog) is not going to be just an easy thing.
You can take a look at http://www.dofollowblogs.com/ The only problem is, even though the listed blog homepage is PR5 or above, the inner page where you will submit your comment have a low PR and sometimes even PR0 or N/A. So take your time to search for it.
commentkahuna - download it and it will find any blog with the keyword you input - with dofollow. Also it lists the Pagerank
Rainmist : I beg to differ. If the software is smart enough then IT WILL find out. Well atleast 90% of the time that is which is not bad... Regards, ASHISH T.