Why Snow Leopard Should Be (Almost) Free: "Specific improvements promised for Snow Leopard include support for up to 16 TB of RAM; improved multi-core support for applications; a next-generation version of QuickTime; out-of-the-box support for Microsoft Exchange in Mail, iCal, and Address Book; and support for OpenCL, which is designed to expose the computing power of modern graphics processing units. Other Snow Leopard promises have included a smaller memory and disk footprint, a faster installation time, and a tweak to Stacks to allow subfolders.
"
TidBITS - http://www.tidbits.com/