window previews, linux type of security(admin)varification, improved(minimized) start menu, DirectX10, a nicer feeling interface, instant search(index’d), can recognize more memory, better kernal, and more than likely, better “next generation” hardware support (look at how 98 support sort of fizzled out once XP was introduced)… just to name a few
a little more in depth here
http://www.microsoft.com/windowsvista/features/default.mspx
have you used it yet?
I can’t wait for DX10 personally… gonna build a vista powerhouse machine once it’s released