After spending a whole lot more time than I had initially anticipated (and significantly more than I wanted to), I have finished tagging all of the former posts. Now that the process is complete, you can click on any of the tags at the bottom of a particular post, and it will show you only posts that also carry that tag. I think that it is a neat feature that really adds to the organisational value of the site.
I’m not sure if it will be beneficial or not to add the “Tag Cloud” widget to the sidebar. Basically, it shows the most commonly used tags and varies the size of the font based on the number of times that the particular tags appear. If you think that would add to the organisation, let me know by leaving a comment or by emailing me.