General operating system updates (I am crossing out the ones that could not really make any different for me):
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• printing reliability (nothing to report here, my printer got updates from Brother anyway).
• sleep and wake reliability when using Bonjour wake on demand (I haven't experienced any problems).
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• reliability of photo screen savers.
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• the reliability of certain third-party USB devices (the only one which actually cause problems turned to be defective and I got it replaced by manufacturer).
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• DNS server ordering as specified in Network Preferences and DNS reliability.
• the reliability and compatibility of QuickTime X ( I am actually using it a lot so hopefully it got better).
• Data Collection: Mac OS X v10.6.3 can collect diagnostic and usage information from your Mac and send it to Apple for analysis automatically.