Below are some quick Microsoft Windows 7 Taskbar tips that can help you be more productive.
Holding down Shift and right-clicking an icon on the taskbar shows the properties for that program.
Quickly open new instance of program
Hold down the Shift key and click any icon on the taskbar to open a new instance of that program. For example, if you had an Internet Explorer Window open, pressing Shift and clicking that icon would open a new IE window.
Open as administrator
Holding down Ctrl + Shift and clicking on any program icon in the Taskbar opens that program and run that program as administrator.
Switch between open windows of program
If you have multiple instances of a program open pressing and holding down Control key while clicking the icon for that program will cycle through each of the windows for that program.