I expanded the blog tonight. There's a new symbol up there—a red loop—meant to capture the standard deletion mark used by print copy editors.Inspired by the correction list featured in most American newspapers, my aim is to catalog significant changes I make to existing posts. Click the icon and you'll find the list.
When I make a change, it will appear there, and at the top of the post I've modified. I don't plan on going back through the archive to log past changes. But I did log an update I made to a recent Python post, just to get an example up and running.
The system is powered by django-correx, a pluggable Django application I've developed. It might take a little work, but it should be pretty easy to port into your Django project, if you're interested in that sort of thing.