A few of us tried this once and it kind of fizzled out. One person supplied two negs, and three of us were supposed to print them both and then exchange. One was a tricky neg, so I didn't get to it and passed it on with the possiblity of printing it later when I had more time, but I printed the other one, held onto the prints for a long time and didn't hear from two of the three others, and then just eventually sent out the prints and didn't get any in return for comparison, and I think someone lost the negs in the meanwhile.
If some folks want to try again, I'd be up for it.