Ctrl+N        Open a new window
Ctrl+T        Open a new tab (if your browser supports tabs)
Ctrl+W        Close the current window/tab
Ctrl+R         Refresh
Esc                 Stop
Alt+←         Back
Alt+→         Forward
PageUp         Move up a page
PageDown Move down a page
Alt+Home Go to your homepage
Alt+D         Move focus to the address bar to type in a URL
Ctrl+Enter Add "http://www." and ".com" around an address
MiddleClick Middle-clicking a tab will close it, even if it's not the active tab