I use SEOQuake for firefox, it allows me to do a load of useful stuff, like for example every page I visit, I know the pagerank of it, I also know if they have nofollow links anywhere, as well as the amount of outbound links and how many backlinks the website has. It's so useful and it saves you a load of time!

I'm using SEO Quake..A firefox add on.It highlights no follow links.

SeoQuake is good for verifying that a link is No NoFollow. There was that NoFollow tool created by a guy but with Firefox 3.6 it doesn't work anymore.