I must say the people at microsoft mustve been smoking crack when they came up with Metro UI...its cumbersome to arrange your apps, you can only close classic apps, metro apps you can just "drop on background" after which windows will close them eventually when it believes you're not using it anymore.
Metro UI is flawed by design, i know dev preview is pre-beta but to be honest, only way to make metro ui viable for PC users is by scrapping it and starting anew. Microsoft is trying to create "one size fits all" UI and failing horribly.
-----signature-----