Update 10.6.5 is recommended for download to all Mac OS X Snow Leopard users and includes general operating system bug fixes designed to improve the stability, compatibility, and security of Mac computers, including fixes in the following areas:
increased reliability when working with Microsoft Exchange servers;
Improving the performance of some image processing operations in iPhoto and Aperture;
increased stability and improved performance of graphics programs and games;
elimination of the delay between print jobs;
Correcting an error that occurred when printing on HP printers connected to an AirPort Extreme;
Resolving a problem that occurred when overloading contacts from the Address Book to iCal;
fixing an error that occurred when an object was overtightened from the stack, which caused the automatic hiding of the Dock to fail;
resolution of problems with incorrect display of Wikipedia information in the Dictionary;
Improving the performance of MainStage on some Mac systems;
Resolving the problem of spacing between characters in OpenType fonts;
increased reliability when working with some Bluetooth braille displays;
Resolving VoiceOver issues when browsing websites using Safari 5.