List of keyboard shortcuts supported by Microsoft webmatrix.
Official list from Microsoft here: http://www.microsoft.com/web/post/webmatrix-keyboard-shortcut-guide
Also, you can use the Alt key to display top level key tips. The top level key tips are show below:
Then, press Alt plus a top level key (such as H for Home as shown above) to show all of the keys that can be used on that tab. Use the displayed key value to access the related functionality.
For instance, Alt + H then T will allow you to print.