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Snow Leopard is, as quoted by apple.com:

Upgrade from Mac OS X Leopard with Snow Leopard, a simpler, more powerful, and more refined version of Mac OS X. It delivers a wide range of enhancements, next-generation technologies, out-of-the-box support for Microsoft Exchange Server, and new accessibility features. It’s the world’s most advanced operating system, finely tuned from installation to shutdown.

Now Snow Leopard is now available for pre-order in your local Apple Store and also online, which is a good route because it is free shiping and could save you some money by not having to drive up to the store. There are a lot of new in and out of the box features that will be available with Snow Leopard.

To see full details on everything to do with Snow Leopard, you can go here: http://store.apple.com/us/product/MAC_OS_X_SNGL?mco=NzgxMDc2NA