Top 10 reasons to buy Windows 7

1. Get quicker access to all of your stuff—usePin and Jump Lists to keep the programs and files you use the most right at your fingertips.
2. Manage open windows more easily—resize and arrange windows simply by dragging their borders to the edge of your screen.
3. Quickly find what you're looking for—use Windows Search to find a specific file, program, or e-mail in a few seconds.
4. Share files and printers among multiple PCs—from one Windows 7-based PC to another, you can share files, music, photos, and even printers across your home network.
5. Stay entertained effortlessly—with Windows Media Center you get one place to enjoy your photos and music, watch and record live TV, and watch free Internet TV.
6. Easily create and share movies—create great looking movies and slideshows and share them on YouTube in minutes.
7. Connect to networks easily—view and connect to any available wireless network in as few as three clicks.
8. Do more and wait less—improvements that can accelerate sleep and resume and make your PC more responsive help you get more done.
9. Touch and tap rather than point and click—Windows 7 makes PCs with touch screens easier and more intuitive to use.
10. Manage devices more easily—manage printers, cameras, music players, and other devicesfrom a single, consistent, place.

http://www.microsoft.com/windows/windows-7/compare/top-ten-reasons.aspx