My favorite XCode 3 keyboard shortcuts

Keyboard:
. Shift + Option + Command + Left/Rigth arrow key: Move to Previous/Next file
. Command Left/Right arrow key: Go to beginning/end of the line
. Command + [ or ] : Indent selection leftward/rightward
. Command + R : Build and Run (Breakpoints off)
. Command + Y : Build and Debug (Breakpoints on)
. Option + Command + R : Run (Breakpoints off)

. Option + Command + Y : Debug (Breakpoints on)

. Shift + Command + E : Zoom editor out

. Shift + Command + W : Close file

Touchpad:
. 3 fingers swipe up : Switch between .m and .h files
. 3 fingers swipe Left/Right : Go Back/Forward