do follow or no follow, that is the question...?

Or is it?

I am working on a very simple product for newbies - something that retells advice I paid for to use with a site that sells a physical product. And paid a lot.

I paid for keyword research, SEO advice and a tool, which is available to all for free, but the company I hired set it up for me and my partner to use. I have now built the same tool for my non-IM niche info business and for several of my clients who know nothing about internet marketing.

So, I am writing up the method as a pdf with a few short instructional videos. I know that many iinternet savvy marketers will be using something like it themselves but I haven't seen anyone actually doing this and relying on this tool.

I'll offer it as a WSO when it's done.

My question is this.

When promoting a site by blog commenting, forum participation (with sig links), etc, are you always driven to check whether the site you are on is giving you a dofollow link?

And if so, how do you do check?

The reason I ask, is that I don't. I know that I won't get a backlink if the link is nofollow, but there are so many other benefits to a comment with a signature.

I know that a lot of my traffic comes from people following those links through (whether they are giving me any juice or not) and I think my approach (in making my blog comments or forum posts informative) makes that worthwhile.

What do you do?

Ian