And The Door. The one that Sayid went and found in the Others camp. The one that was just a door with rock behind it. In Live Together, Die Alone.

The hatches are:
"The Staff(The medical hatch)"
"The Flame(Not yet discovered)"
"The Swan(The losties hatch)"
"The Door(Is a prop used by the Others)"
"The Pearl(The monitering station)"
"The Arrow(The tailies hatch)"

__________________
"See you in another life, brother." -Desmond