The Win 7 team has been hard at work taking user feedback and incorporating them into Win7. Some of the most notable are like being able to press <WindowsLogo> + number key to launch applications.
For example if you find that you are launching Internet Explorer (or say any other browser frequently) you can make that <WindowsLogo>+1 key. So merely by pressing <WindowsLogo>+1 you will be able to launch your browser. This is for keyboard enthusiasts who want high efficiency.
You can read about this and about 3 dozen enhancements that have been done to Win7 (based on User feedback from the initial beta release)