Windows 7 is not “Vista service pack." Though both of them vista and win 7 share the same core technology but windows 7 is way different than vista. What that means is that Windows 7 is what Vista should have been in the public eye—a solid OS with plenty of modern eye candy that mostly succeeds in taking Windows usability into the 21st century—but it doesn't daringly innovate or push boundaries or smash down walls or whatever verb meets solid object metaphor you want to use, because it had a specific set of obligations to meet, courtesy of its forebear.
If you haven’t tried or used vista before and coming from XP then, Windows 7 will totally feel like a revelation from the glossy future. If you're coming from Vista, you'll definitely say “where are all those bugs”. The first time you touch Aero Peek or use integrated voice recognition or aero shake like features you are bound to be mesmerized. To read more go to www.microsoft.com/windows/windows-7 and download 90 days trial of the windows 7 enterprise version.