Did you know that SharePoint has shortcut keys? Most Windows applications have a standard set of well known shortcut keys. While most web applications do not, SharePoint has a large number of shortcut keys, and a few like the OK and Cancel shortcuts can save you a lot of scrolling up and down the page after each edit..
Here are a few samples:
Alt-1 + Enter Goto Home page (same as clicking Home tab)
Alt-6 + Enter Help
Alt-l + Enter Welcome menu
Alt-o OK or Create
Alt-s Search - move cursor to Search text box
For a complete list see: