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I think the best way to comment on a blog is to make a useful point that furthers the discussion of the blog post. Use your real name as the anchor text. Link it to your 'About' page that features your bio. If you don't have an about page, consider linking it to your home page, twitter profile or your G+ profile. If your comment is awesome, the blogger will figure out who you are and what your site it about. Then, they should realize that your site is also awesome and become a fan. Comment to build relationships and advance discussions. Not to build links. Also: the Mozbar is an easy way to check follow/nofollow links. Works in chrome and firefox. Although, I don't think you should let that sway you from making a comment. If you have something good to say, say it. If you don't, stay quiet on that post.

Hi James, Thanks for responding. We hired an SEO person to help us at the beginning of last year, that ended up not working out. I know she was working on link building, and it seems like she must have left comments on irrelevant blogs.. What do you recommend in this situation, focus time on getting high quality links or trying to get the bad ones removed? And is blog commenting still okay to do on blogs that are relevant to our industry, or does google see that as spammy? Thanks! Audrey