New Design/UI (Eg: Ribbon control)
Silverlight WebPart
Improvement in browser compatibility
Improved Central Administration UI
Edit your pages directly
Rich Theming
Visio support
New SharePoint designer (2010)
Faster Search

 
SharePoint 2010 will be available ONLY for 64 bit hardware
Hardware requirements for SharePoint 2010 are:
 

64 bit Hardware
64 bit OS (Windows Server 2008)
64 bit SQL Server

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