I guess one of the drawbacks of using a site like Blogger or a script like Wordpress when blogging is the lack of control you can have. What I did not know, and I have been blogging for over a year, is that the site sets links in my comments field to 'nofollow'. What this means is search engines will not follow the links from my comments. So, search engines that are cawling my blogs do not follow links in comments, and thus there is no link love for commenter.
I read about a movement called 'DoFollow'. This movement changes the settings so that the links in comments are following by search engine spiders. This means that commenters can boost their pagerank when they comment on DoFollow blogs.
Thankfully, there are ways to fix the scripts so that you can have a DoFollow blog even with Wordpress, Blogger, or other sites that automatically set links to nofollow.
I found extremely simple directions to this on Tips 4 Blogspot. Even me, an admitted technotwit and technophobe, could follow these directions.
Once you have changed to DoFollow, consider adding one of these free logos by Randa Clay to your blog, so readers will know that you have joined the movement.
And one last step: there are a few blogs that keep lists of other DoFollow Blogs. You can post on Courtney Tuttles's blog to have yours added. You can also list your site on the DoFollow Directory.