search for nofollow in the source code of the home page or the outbound links from the site. if they don't have nofollow then it is a dofollow blog
Open the blog in Firefox then right-click on a link in the comments and select Properties. If it doesn't say nofollow then it's the default "do follow"
Also look for the <META NAME="ROBOTS" CONTENT="INDEX, NOFOLLOW"> command in the meta tags. That tells spiders not to follow any link on the page.
@scottgrace25: The nofollow for links is different from meta nofollow. Most search engines don't support meta nofollow anyway.
you can just use a free seo tool and install it to Firefox after adding it enable "highlight no follow links " option .IT will be marked as red if blog id nofollow download it from here http://tools.seobook.com/firefox/seo-for-firefox.html
I use Fire Fox and the Nodofollow plugin. Although I swear people must just not check because people continue to recommend and post lists of dofollow sites that are 50/50 at best.
Very simple. Right click on any outbound links. If it shows nofollow tag, it is not a do follow. Other wise it is well and good.