Thanks NatCh! I appreciate the welcome and the bump. It's always hard to catch on to the bumping etiquette of a new forum. :P
Anyway, now that you've presented me with this opportunity, I think I'll update my questions here.
1) The library1.db file doesn't change in size no matter how many ebooks I import into libprs, or convert to lrf. So I guess my question now is simply "when you import books and convert them, where are they stored?" I'm just curious how that system works.
2) Regardless of how many I do at once, or which files I use, libprs crashes with the same error I mentioned before when I try to do multiple ebooks. So I guess that question is answered. I'd still appreciate it if someone could point me to a program that would convert multiple files at once, though. I've heard that some of the command line tools will do it, but that you generally have to write a script to get it to batch convert. I wouldn't know how to write such a script without quite a bit of research, but I'm fairly confident I could implement one if someone could share, along with vague instructions.
Any takers? I'll thank you bunches, and stuff.
(thanks again, Natch)