thats just a skin sorcre... if it wasnt against my beta contract to show you i'd show you what .Net actually looks like
its got a more simplified version of the current XP Blue/Silver/Green desktop called Shadi as the standard, its very plain but is quite nice

(alot of people hate it though)
it consists of 3 task bars, the current Task bar your used to - the Program Bar & the Explorer Bar ... they're all quite useful especially using the new WFS which was shipped about a week ago, you can search a HDD in under 30seconds (a 160Gb one at that)
it holds alot of data and encryption actually per file so you loose about 10% of your total HDD space unfortunately but the change from 32bit to 64 or 128bit is pretty awesome
it now natively accepts 128bit colour mode as well as something called Tritonic 196bit colour mode - i can't get it to work on my Fx but i'm sure there is something which can use it.
as for running old Windows Software... DB 1.13 runs perfectly on my XP machine and works just as well in .Net so i wouldn't worry.
it comes with DirectX 9.1 as standard (right now, but probably 10 as it still have 2years dev to go)