Closing Multiple Taskbar Items

If you hold down the Control Key when you click on the taskbar icons,
it selects multiple tasks. Then you can simply right-click on the selected items and choose close group.

This tip works with all windows, not just one applications. If you have the cal, ie, notepad and solitaire open, it will close them all, unlike the group similar items command that only lets you close all of one type (ex: all IE or all notepads).