actually longhorn will use a new graphics model, they are doing away with GDI. and going with soemthing else that can handle mroe animations per second, more full motion video feeds at once. and dvd quality animation for regular explorer windows.
you can also play more then 10 full motion max frame rate videos at once! windows GDI only allows for 3! also it will be able to use more of the GPU ratehr than your CPU for the graphics rendering of windows. so explorer wont take asw much system ram so apps will lanuch faster. I love the new graphics model.