I didn't notice it before... toward the upper right, each post has a number. I'm guessing it signifies the chronological place in the total for the whole site - all forums. Is that correct?
On other sites, I've noticed a number, similarly placed, signifying the number in that thread. Is that also an option with the UBB software?
I'm not sure that there's any utility for either, but if people were going to refer to a post by number, seems like it would be easier to work with the latter.