Intel Mac users will like Snow Leopard's smartly designed interface enhancements, and its Exchange support is a must-have (especially with Outlook for Mac on the way). With a ton of technological improvements, Snow Leopard is worth the $29 upgrade fee.
Apple has released a couple of updates for OS X systems. The first is an audio update for Early 2009 Mac Pro systems that are running OS X 10.6.3, and the second is an updated set of Epson printer drivers. The updates should be available via Software Update for relevant systems, but also can be downloaded at the following web pages.
Apple has updated a couple of knowledgebase articles, one of which covers how to tackle problems with Mail connectivity in OS 10.6, and others that discuss the enabling of Magic Mice gestures and how to prevent a specific iMovie crash in OS 10.6.3.
An ongoing issue that people have had with the latest 10.6.3 update is with changes to the Finder's handling of files when copying to mounted SMB shares.
An ongoing issue with OS X 10.6.3 seems to corrupt graphics on external displays when you present in full screen with "mirrored" displays. The display will work and show the mirrored desktop in the Finder, but when applications take over use the display to show full-screen presentations, media, or other purposes, the graphics will garble and can only be fixed with a restart.
Apple has posted a revised updater for the OS X 10.6.3 update, which should appear in Software Update on systems for which it applies.
Users have reported an issue with their Mac when entering sleep mode. After installing the Mac OS X 10.6.3 update and attempting to put their Mac to sleep, the system freezes.
Apple has released a knowledgebase article (reprinted here) that covers details regarding DNS server handling in 10.6 and the 10.6.3 update.
Apple has released the OS X 10.6.3 update, along with a security update for OS X 10.5.
With the 10.6.3 update Apple addressed a number of graphic issues, but in doing so introduced a problem for some people where they cannot get external monitors to either display the native resolution, or in some cases even work at all.