Apple has released an OS X 10.8.4 update. Items that caught my attention in the release notes include: improved Active Directory log-in performance for cached accounts, fix for saving issues to SMB shares, Exchange compatibility improvements with Calendar, and better support for connecting to certain enterprise W-Fi networks.

Although not listed by Apple, the OS X 10.8.4 update appears to bring back the ability to read HFS formatted CDs, something that has been broken since OS X 10.8.3 came out.