SHIFT + RIGHT CLICK

Gives "open with" in context menu

ALT + DOUBLE CLICK

Display properties

SHIFT + F10

Display context menu (same as right mouse button click)

CTRL+ESC, ESC

Start button. (TAB to select task bar) (SHIFT + F10 for context)

ALT + F6

Switch between multiple windows (even if not MDI)

F4

IN EXPLORER: open address box

'KEYPAD *'

IN EXPLORER: expands everything

WIN + R

Run dialog

WIN + M

Minimize all

WIN + SHIFT + M

Undo minimize all

WIN + E

Open Explorer

WIN + F

Find dialog

WIN + TAB

Select Taskbar buttons

WIN + BREAK

System properties dialog

CTRL + 'KEYPAD +'

Autosize columns