I have now been able to provide "labels" for the majority of the almost 400 posts of this blog.
You will notice at the bottom of most posts what Blogger terms "labels". Other applications might use the term tags. If you pick on a "label" all blog posts that have similar "labels" will be displayed. I accomplished this relatively quickly and not with a fine-tooth comb. So there may be some posts that are not perfectly "label"ed.
This was worth the effort because this can be a good method to find all posts that have to do with a particular subject, such as Vault or Profiles etc.
Give it a try, see if it helps. Feel free to comment about any posts or "labels".
I will add some of the current "labels" to this post, to kick start the process.