Firstly, congrats on organizing this gr8 giveaway. :)

I’m using Windows 7 since its RC release and found it best, very fast, impressive GUI and most stable OS made by MS till date.

Features I liked most in Win7:

1. Taskbar (Superbar) looks awesome, pinning and jumplists r useful.
2. Aero snap & Aero peek r cool.
3. Official Windows 7 themes r amazing & simple to use.
4. UAC and Parental controls r improved.
5. Windows XP mode
6. Compatible with almost all applications & software’s.
7. Aero works gr8 w/o consuming much resources.

Windows 7 is truly special, that’s why it has been adopted by more than 10% of PCs worldwide with 240+ million licenses sold in just 1 year. Do try it now if you haven’t!