I've been working with Beth Kanter on the creation of something similar to the eLearning Learning content community, but centered around the vibrant community that focuses on the use of technology in nonprofits. This is a work in progress, but she's done a pretty good job explaining what it is and why she's doing this in her post: How Do You Browse By Category Blog Content from NpTech Bloggers?
She raises some interesting questions around how you browse through existing blog content which was one of the primary reasons for originally creating the technology. As a blogger, keeping my labels/tags/categories up to date, was always very hard. So, this technology not only does that for me, but it helps surface the particular terms that I use more than others.
If you have thoughts on eLearning Learning or Nonprofit Technology, this is still a work in progress and we are hoping to get feedback.