I love a good keyboard shortcut - it always slows me down when I have to move away from the keyboard to use the mouse. Apropos, here are some great keyboard commands to note:
In Dreamweaver:Control + J to collapse the first parent block of code that contains the cursor.
In Firefox (also Outlook, IE, and many other applications with auto-suggest functionality):Shift + Delete (while highlighting an automatically suggested text block) to delete that suggestion from the application and prevent it from appearing again.
Remote Desktop Connection for Windows:Control + Alt + Break to toggle between full screen and windowed mode.
When using Mac OS, substitute Command for Control.