Savar you should read that Ars link I posted above. There's no good reason why the entire desktop should be vectors and there are many reasons why it shouldn't be. High enough resolution bitmaps can be used to elements that it doesn't matter that they become blocky. Its not likely for example that someone would ever need a 1 foot wide "close" button on their window title, so making a 100 pixel high version and scaling according to the DPI of the monitor is good enough.