Apple has released Mac OS X 10.6.3, the update includes:

• performance of Logic Pro 9 and Main Stage 2 when running in 64-bit mode.
• printing reliability.
• sleep and wake reliability when using Bonjour wake on demand.
• a color issue in iMovie with HD content.
• glowing, stuck, or dark pixels when viewing video from the iMac (Late 2009) built-in iSight camera.
• an issue in which the Finder reports a -36 error when copying directories to a drive formatted as FAT32.
• reliability of photo screen savers.
• compatibility issues with OpenGL-based applications.
• an issue in which shadows in PDF of Aperture book are black instead of gray.
• an issue in which the microphone level in iChat may not increase the volume after reducing it to prevent a feedback event.
• the reliability of certain third-party USB devices.
• the Accounts preference pane can now limit login to members of groups hosted by a non-Apple directory service, such as Active Directory.
• DNS server ordering as specified in Network Preferences and DNS reliability. For details about how Mac OS X v10.6 handles unresponsive DNS servers, see this article.
• the reliability and compatibility of QuickTime X.

AirPort and wireless networking fixes for:

• general reliability for wireless connections.
• improvements to 802.1X reliability, including closed network connections , and WPA2.
• sleep/wake reliability for current iMac models when connected to 2.4GHz wireless networks.

Date and Time fixes provided for:

• Daylight Saving Time rules to reflect recent changes in areas including Argentina, Fiji, Pakistan, and Antarctica.

Directory Services fixes provided for:

• an issue that could cause the system to become unstable or unresponsive when bound to an LDAP server using SSL.
• an issue in which the 802.1X Loginwindow Profile is in place, but the wireless network is not available, directory authentication over Ethernet will now succeed.

File Services fixes provided for:

• an issue that could prevent saving files from Microsoft Office 2008 to an SMB server volume.
• issues copying, renaming or deleting files on an SMB server volume.
• clear-text authentication enabling to an SMB file server.

iCal fixes provided for:

• changing the invitation list for a single instance of a recurring event will no longer “un-book” the location of the meeting.
• an issue in which new invitations on a Microsoft Exchange server might not appear in the Notification pane.
• properly showing recurring Microsoft Exchange events which have a set end date. For details, see this article. 

Mail fixes and improvements provided for:

• an issue that causes background message colors to display incorrectly in Mail.
• signing and encrypting messages, such as when using an Entrust PKI (Public Key Infrastructure).
• synchronization of the “Sent” mailbox on a Microsoft Exchange server.
• an issue that could cause Mail to delete mailboxes on a Microsoft Exchange server that is hosted behind an Internet load balancer.

Mobile Accounts fixes and improvements provided for:

• home directory synchronization when the home directory is stored on an SMB file server.
• properly warning mobile users in an Active Directory domain about upcoming password expiration.
• creating a Mobile Account that uses smart card authentication, without using a command-line tool.
• reliability in background synchronization.

MobileMe fixes and improvements provided for:

• an issue in which movies could not be viewed in Safari when visiting www.me.com/gallery.
• reliability of iDisk Sync.
• reliability of syncing calendars.

Parental Control fixes and improvements provided for:

• restoring Safari bookmarks functionality to parental controls users.
• better handling of Safari bookmark management when using Parental Controls.
• more reliable application launch restrictions when using Parental Control.

Rosetta fixes provided for:

• an issue that prevented files with the # or & characters in their names from opening in Rosetta applications.

System Imaging fixes and improvements provided for:

• the asr command, which now accepts the “–allow fragmented catalog” option, for restoring images that have a fragmented catalog file. For details, type man asr in Terminal.
• the installer command, which can now be used to upgrade a Mac OS X v10.5 system with a QuickTime 7 Pro key installed to Mac OS X v10.6.

Time Machine fixes and improvements provided for:

• reliability from Time Machine-to-Time Capsule backups, including multiple computers.
• an issue with Time Machine in which system backups could be restored onto unsupported Mac configurations.
• an issue in which a Time Machine backup might not work using an AirPort connection.

Xsan fixes and improvements provided for:

• the reliability of Fibre channel connections to an Xserve RAID.
• an issue that could cause the size of certain Fibre channel LUNs to be mis-reported.

So, just simply click on the Apple Logo then click “Software Update…” then follow the on screen instructions from there. The Mac OS X 10.6.3 updates weighs in at 438.7 MB.