I know there's a SVN Revision Id at the bottom of every page, but I think it'd be nice if we could see a couple short sentences about what went into the deployment. Not changelogs in the commits, but a little blurb like "fixed bug with username not showing on tags/users page; added links in users profile page to other family sites" would be handy to know what to look for.
Edit: Another argument for this. At some point, careers silently changed from showing all of your SO accounts to letting you pick the ones you wanted. Which is nice, great feature. Except it hid all the accounts except SO. So for an undetermined period of time, I was not showing flair I would have liked to show. Obviously this isn't the end of the world, but it's example of how a changelog benefits the community.