Thanks for the quick responses, all!
I didn't get the impression they were trying to"steal" my recipe or anything of the sort. My first thought was that I was ecstatic my brew is good enough for someone to want to reproduce commercially and I get the opportunity to assist in the brew professionally. That was enough for me. And yes, as a bonus they offered to fill one of my kegs for me. :rockin:
After sharing my excitement with a few people, some thought that royalties or something of the sort was in order since they stand to profit from my recipe, and maybe substantially. I just figured I would turn here, where I get all my questions about brewing answered, to see what the thought was on this. I think this will be a one off type thing, and give them the recipe, maybe get a gentleman's agreement of some sort where if they do it frequently other arrangements can be made.