I am currently in the process of adding subject labels to all of my posts. Then when I'm done you'll be able to browse my blog by category and subject, which will make content easier to find. So, if you subscribe to my blog feed and you're wondering why old posts are getting bumped to the top, that's why. Every time I add a label to a post, it sends the post to your feed reader as if it were brand new.
Thanks for your patience.