The SO blog is a critical resource for information about the operation of the SO family of sites. In the past I've suggested moving the blog link from the bottom of the page to the top so it gets more visibility. I still think that's a good idea.
Now, though, I think it ought to go further. Whenever a new blog article that impacts SO operations is published, the SO family of sites ought to display a banner announcing it for 24-48 hours after the initial publish date. This provides a significantly more visible mechanism to communicate important information about site changes via the blog without being too annoying in doing so.
While I know it won't solve the problem of clueless users entirely, I think being more proactive in communicating changes and making sure that people know about the avenues of communication would enhance the site.