Hi Kimbo,
Well,The big one is speed, but overall, it just feels more natural than Vista or XP to me. It's hard to describe exactly what it is, but after using 7 for a while on my laptop, my desktop just doesn't feel quite as smooth or intuitive. It also added a solid 20-30min to the battery life of my laptop compared to vista.Major benefit to Windows 7 is that it allows you to use your hardware for something other than Bios post watching.Minor benefits include - it's going to be supported for a while, not like XP and the ability to load your favourites.
/edit - yes, it's called sarcasm. happen to have it in supply, kinda overstocked - gotta move it out while it's here.
Thanks