Linux user interface is way above all the windozes, virtual desktops by default, you actually can tune kinda anything you want. After trying out a linux you wont be back to windoze.
Also linux is alot faster than any of the windoze systems (Well booting takes abit longer but after it its faster), linux also gives professional users alot better workaround than any of the windozeses ever, <3 bash
And on windoze you need to download applications for every file you want open, it wont even open a .rar without help of third party as linux has opened every file i have met this far (Also runs windoze .exes and plays all the videos including M$ formats).
Theres nothing what is better on windoze systems. (And all "new" features of vista are copied from linux and OS X. kthxbye)