Well, I don't know if you're aware of this neat trick, but for all of you still using those wonderful old film bodies or the *istD, DS or DS2 (in short, any TTL body, not those fancy P-TTL ones
), you can use some Nikon film flashes as wireless TTL slaves!
Some pre-DSLRs Nikon SB flashes indeed offer an (AFAIK) unique slave mode called SU-4 (named after the little separate unit that can also transform non-SU-4 flashes into TTL wireless slaves).
In this mode, the slave flash not only detects when the main flash is fired,
but also when it is cut off by the camera, and so reacts accordingly and shut off its own burst.
Yeah, that's right : Nikon really made an universal TTL wireless slave flash, back in the film days...
Best part is that the last crop of Nikon film flashes featuring this are simply useless on Nikon's DSLRs, so they can be found for next to nothing, and are in really good shape...
The SB-50dx, for instance, has this ability and can be easily found for 50€... So has the SB26 (IIRC), the SB-80dx, and some others...
So, if you can try this, shoot and post some sample!!!