While the bulk of the improvements in Snow Leopard are reported to be enhancements to existing Mac OS X technologies, there are actually plenty of new features to get excited about as well. Some new things that you can expect to see in Snow Leopard are Microsoft Exchange support, Open CL, and Grand Central Dispatch.
System administrators and Microsoft Exchange users should be thrilled with the new integration of Exchange features directly into OS X. With Mail, iCal, and the Address Book all speaking the Exchange lingo now, integration of Macs into the workplace will be easier than ever.
Open CL is technology that will allow developers to take better use of the processing power built into modern graphics chipsets. Open CL promises to allow software to get even better performance out of your existing hardware.
Similarly, Grand Central Dispatch is new technology developed by Apple to allow developers to take better advantage of the multi-core CPUs that are becoming standard in today's computers. By allowing better scheduling of the multiple CPUs and giving developers easy access Apple hopes to usher in a generation of software even more responsive and powerful that what we have today.