As Visual Studio has evolved as a product, so has the plethora of keyboard shortcuts that are available. Using these shortcuts make certain tasks much easier and quicker by not requiring you to remember the exact location in the often deep and convoluted menu and icon structure.
You can download your own keyboard shortcut guide here:http://www.microsoft.com/downloads/en/details.aspx?FamilyID=92CED922-D505-457A-8C9C-84036160639F&displaylang=en
Each binding refers to the Developer Settings option you choose when you open Visual Studio for the first time. The document also contains the instructions for changing your default setting.