Wow, great photos evil! If I had seen one of those the first time my fish had dropsy I would have known what it was straight away.
Aquarium dude - as evil says your fish does need to be euthanaised - there are various opinion around on how to try to cure it but once its vital organs are shutting down, which is what causes the swelling because fluid is retained, I don't think theres anything here in NZ that would even remotely help it.