1) Full Automatic installation and settings.
2) Beautifull,Different,Stable,Fast and secuer.
3) Service Pack 3 Final Version 5.1.2600.5512.
4) New hardware drivers for Graphic,Sound,Chipset,Lan,...
5) New applications Such as IE7,WMP11,Winrar,Unlocker,...
6) Supporting formats such as PDF,DVD,3gp,...
7) Iran main configuration settings.
To read more:
Just click Hotfixes and Features buttons.