1) simplicity, ease of use, preserves resources
2) multiple applications frequently. Usually have atleast 3 applications at any given time.
3) alt-tab or task popup from theme if window is full screen or popup's task list if there is some desktop to click on
4) elaborate GUI for VWM: tell me what desktop i'm on and give me a quick way to switch. CPU/Mem usage blech! ctrl+shift+esc gets me there just as easily
5) winamp control, quick navigation, simplicity ( :)), song information, clock/date

-Jon