I have OS X and this does not impress me at all. The OS has this same level of functionality and 10.8 will take a step further. Plus, OS X can do it with a lot less ram.
A mac with 512 can have 5 different avi (tv shows) playing at the same time, audio coming fromthe one that is considered the front app; itunes playing int he background, pages open and creating desktop publishing documents, firefox open with 3 tabs and a terminal session. Then use the remote to 3d the desktop to the background and launchthe media server aspect of the OS. Vista is recommended to have at least 2GB of ram according to a MS rep.
I will not be buying vista at all. it is still cludgy! However, I will buy os 4.0 if it ever comes out. And, my A3000 still has a special place on my desk next to the MAC. The WinTel, well, I put it in the closet and it is only 7 years old.
