Autoblog

Say you're developing a website with information on a particular subject. The website is expanded and updated bit by bit. For the user tracking the website, seeing all of the changes and new material would require going through every page, unless changes/additions are highlighted on a blog. The problem is that such a blog requires more effort from the creator. So would it be possible to autoblog the changes? Changing typos and formatting probably important enough to capture, but new pages, or significant additons/removals to a page should automatically be blogged (with a link to the page).