I guess, most people prefer commenting into a 'dofollow' blog... my question is on how to find a ''dofollow' blog.... so I will not be wasting my time commenting into a 'nofollow' websites..
You can use seoquake to highlight (strikethrough) 'comment' links in blog to find if they are dofollow or nofollow. I have put together a dofollow for people who might be interested in finding them