At the risk of my heart beating lumpy custard, I also want to chime in and say thanks - not only for great software, but also for great vision. I can definitely see this revolutionising how people communicate on the internet into something a lot more meaningful.
I have never used Ruby before, but in the course of a day I was able deploy a virtual Ubuntu server and follow your clear instructions to get a working instance, so kudos on your documentation and communication style as well.