The title says it all.
First, some definitions:
Re-Pop: After a certain amount of time, or intervals of some kind, or after a random roll, the room or rooms re-populate with the original monsters encountered there. Kill the dragon in room 21, after X months room 21 gets another identical dragon (or a stronger one.)
Re-Stock: After a certain amount of time, or intervals of some kind, or after a random roll, new monsters move in to cleared areas. They may move in from other locations in the dungeon, or show up from random rolls on a monster-stocking table.
Static: Anything cleared, remains cleared. Cleared areas are not re-populated, re-stocked, or otherwise changed except through direct player action.
I'll accept a multiple answer - I have special areas that with definitely rep-pop, even if my dungeon is almost entirely re-stock. I find static works well for the S&W B-Team, since we play so rarely that re-pop or re-stock would totally derail exploration of new areas.
But yeah, like it says, do you do those in your dungeons or (especially) megadungeons?