Hibernate is an nice option in windows, it allows you to save work and resume it from where you had left, but its not enbaled by default and even you try to enable from command prompt it wont come up, here is a small trick to enable it.
Windows 8 comes with new live tiles like Start Menu or Start Screen, you can such start menu on your Windows XP, Vista, and 7
Windows 8 Release Preview comes with a new cursor set, If you too loving it then you can download it and start using it on Windows XP, Windows Vista and Windows 7
Both Windows 7 and Windows 8 comes with a hidden feature which allows you to get Animated Windows Explorer. Use this simple tool to enable it.
Customize the look and feel of your Windows 7 startup by using these new and beautiful animated Fire Boot Screens
If you want to access your so called God Mode which allows you to have all task at one place in Windows 7 faster and easily then add it to your Control Panel
Windows 8 comes with a minimal metro style Windows Task Manager, you can get same on your Windows XP, Windows Vista or on Windows 7
If you are an Aero Glass lover then here is an Portable Aero Glass MP3 Player which gives you full aero effect.
Download a single transformation pack which will transform your Windows in to Windows 8 and you will get new look on your same machine.
Almost all Laptops, Netbook, and Notebooks comes with a Fn key which allows you to access some important function but you need to press 2 keys to access that function, Here is a tool which disable that Fn key.