Windows 7 which was demoed at PDC, has some theme change in the form of taskbar and start menu. If you liked the Windows 7 theme and like to try it out on Vista, you can do it by downloading the theme for Vista made by Deviantart user DJ Gx. He has created two themes based on Windows 7 for Vista.

My_Windows_Seven_PDC_on_Vista_by_giannisgx89

Download Theme

New_desk_by_giannisgx89

Download Theme

Thanks VG