This shot was taken during the shooting of the promotional video for Nik Software's Silver Efex Pro 2.
As for this image: of course I used Silver Efex Pro.... what else;)
ND110 - 10 stops.
282s (4min42sec) exposure
PS CS5 - Silver Efex Pro
Other Post processing equipment:
Wacom Intuos 4 tablet for some accurate editing.