When I right clicked on the minimized iTunes (7.4) window I discovered a new feature! There is now an option to close the window from its minimized state, a feature that I have wanted in OS X for a while. Maybe this is something that will come system wide in Leopard?
Here are some screenshots...
Here is the iTunes window with the new close option
Here is a Safari window... as you see there is no close option.
Here are some screenshots...

Here is the iTunes window with the new close option

Here is a Safari window... as you see there is no close option.