I'm going to sticky this thread, since it comes up so often. We can use this as a catch-all.
Okay, so since Aatrek
was nice enough to honor my request (or maybe he just had the idea himself and didn't even notice that I asked about this), I decided to go ahead and dig around for the other threads on this subject. Since the thread's name was changed from DS9-Relaunch, and is now a stickied catch-all, this seems like a good place to post them, if anybody else is interested in past Trek Lit "casting calls."
The only one I could find on the TrekBBS: Casting Titan
And a few from the Simon Says Trek boards:
Casting Novel Characters
And finally, another Casting Titan