Finally, I have now the impossible-to-find (in Cebu, anyway) Nikon SC-28 TTL Flash Cord.
I quickly assembled a rough setup for rim lighting (one of the many possibilities with off-camera flash photography): A 3' x 3' illustration board (black side is facing the camera) was center-clipped to a large 4' x 4' translucent plastic (that came with the uncut illustration board). The plastic serves as a diffuser. The flash was then put behind the plastic/illustration board with a distance of about 2'.
Subjects were positioned about 1' from the illustration board and here are some sample shots:
SB-400 attached to D40 by SC-28 flash cord: