The best thing about Vista
In XP this happens...
However in Vista ... only this happens
http://www.microsoft.com/technet/technetmag/issues/2008/01/SecurityWatch/default.aspx
"Windows® versions prior to Windows Vista® will, by default, automatically run programs designated in the autorun.inf file on CDs, but not on USB drives. By lying about itself, the U3-enabled USB flash drive fools the OS into autorunning something called the U3 launcher. The U3 launcher, in turn, can start programs, give you a menu, or do pretty much anything that you could do with the computer yourself."
Read the complete post at http://msmvps.com/blogs/bradley/archive/2007/12/30/the-best-thing-about-vista.aspx