I could find it then, but not now...
T : Talk ingame
ENTER: Enter vehicle as driver
HOME: Enter vehicle as a passenger
Right Mouse Click: (On foot) Activates the 'car scanner' when on foot. This shows all vehicles on your minimap/radar.
F9: Player details ON/OFF
F10: Hide/Show chat history
F11: Show scoreboard
F12: Take screenshot (using '/screenshot title.bmp' inside the in-game chat will name the resulting bitmap)
TAB: Exchange weapon (when attempting to pick up one of same 'class')s