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)
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Encrypted Screen Sharing in Snow Leopard
In Snow Leopard, screen sharing in iChat can now be encrypted if both parties sharing a screen have MobileMe accounts and have enabled encryption (iChat > Preferences > Accounts > Security).