I would love to see a cross-server Friendlist/Blacklist feature implemented in the future. I have met SO many cool folks from other servers whilst using DF, I think it would be great to be able to communicate and even group with others cross-server. I doubt we will ever see such a thing, but that doesn't stop me from wishing for it! "Emulating" a certain game companies version of this cough*battlenet*cough would be swell!