Wow this what say when saw that SharePoint has Shortcut Keys, what cool feature. Shortcut key most of the time available for Windows Application till date most of the web application do not have this functions.
Some sample keys
View All Site Content link. ALT+3
Site Actions menu. ALT+/
Search link. ALT+S
Help link. ALT+6
Home link. ALT+1
Site Actions menu. SHIFT+ENTER
New Document ALT+N
Upload Document ALT+U
For details of more shortcut keys visit