I stopped over at Mom's Online Garage Sale and found this post. It was such an important issue that I decided to share it with you all.
Almost all blog platforms by default are set up so that a "dead end" piece of code is inserted wherever there is a link in a comment, so that search engines will not "count" the link as they are crawling the internet. This was originally designed to help stop comment spam, but it doesn't work. What it does is remove some of the incentive for your readers to contribute to your site by commenting on your posts.
What can you do about it? Turn off "nofollow". Show your commenters that you appreciate them. Spread the link love.
Go to Randa Clay Design to download your "I Follow" Logo and see detailed instructions for turning off No Follow today.