Summary: 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 AU$39 upgrade fee.
Pros: Interface enhancements make finding apps and files much easier, A completely overhauled QuickTime X now sports a cleaner interface and recording tools, Exchange support across Mail, the Address Book and iCal is huge for those who take their Macs to work
Cons: Snow Leopard works with Intel Macs only, PowerPC users are out of luck, Requires AU$39 upgrade fee
Summary: The grace of Leopard's interface enhancements makes productivity more pleasurable with a Mac, as more than 300 functional and fun features top off this update.
Pros: Elegant backup via Time Machine, Finder offers powerful navigation tweaks, Novel workspace customisation through Spaces' virtual desktops, Integration with Web data and applications, Cover Flow visualises file browsing, iChat Theater offers green-screen backgrounds and lets users access each others' desktops, Boot Camp included
Cons: Some new features, such as geotagging, aren't obvious to find, Users with older Macs can't run Leopard