Good Gear Guide
Beta vs RC: What's new in the Windows 7 Release Ca...
Though Windows Flip still remains in Windows 7, Microsoft has improved on the traditional Alt-Tab method. Not only does the RC include window thumbnails, but Microsoft has also integrated Aero Peek into Alt-Tab to ensure you find the right window. While holding down Alt-Tab, highlight your desired window, and all surrounding windows will fade away — handy, right?
Beta vs RC: What's new in the Windows 7 Release Candidate?