Apple has pushed out OS X 10.6.4, an update to their Mac OS which includes various security updates, bug fixes and Safari 5 as standard. Interestingly, the update is also listed as affecting MobileMe, though there's no mention of any applicable changes.
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OS X 10.6.4 should be offered to Mac users via the Software Update tool, though you can manually download it here if you have multiple machines to upgrade. Meanwhile there's a separate version for OS X servers, which improves file, directory, calendar and mail services, among other things.
General fixes and improvements
improves compatibility with some Braille displays
resolves an issue that causes the keyboard or trackpad to become unresponsive
resolves an issue that may prevent some Adobe Creative Suite 3 applications from opening
addresses issues copying, renaming, or deleting files on SMB file servers
improves reliability of VPN connections
resolves a playback issue in DVD Player when using Good Quality deinterlacing
resolves an issue editing photos with iPhoto or Aperture in full screen view
resolves an issue with Parental Controls Time Limits for Open Directory or Active Directory users
resolves a display sleep issue with MacBook Pro (Early 2010) computers
resolves an issue with MacBook Pro (Early 2010) computers in which the right speaker may sound louder than the left speaker