Apple has released OS X Server 2.2.1, with the server add-on for OS X 10.8 Mountain Lion adding a couple of features in addition to some stability fixes. First up, a Caching Server has been added to improve download speeds from the Mac App Store, enabling you to download one copy of the software to your Mac running OS X Server and then distribute that copy to other connected Macs. The release also adds a Time Machine monitoring service that can check to see which computers have backed up (including information on size and time of last backup), Wiki Server support for Retina displays, and a Centralized Certificate management interface. This update fixes an issue with deleting apps uploaded to the Profile Manager, setup failures caused by an SSL error, and problems with upgrading from Lion Server. Additionally, OS X Server 2.2.1 includes a few security patches focused on closing some vulnerabilities related to Ruby on Rails. ($19.99 new, free update, 153 MB, release notes)
Two Shortcuts for App Exposé
If you want to see all the windows for a particular app via App Exposé, there are two hidden shortcuts. For either, start by pressing Command-Tab to bring up the app switcher. Then, while still holding down the Command key, press either the 1 key or the up arrow. That puts you into App Expose mode, with all of an app's windows showing, and recent documents in a row across the bottom of the screen. Let up on the Command key, and then you can press Tab to cycle through all the running apps.