One of the projects that I want to do when I have time, is to create a MUing tutorial webpage.
It would start with why people would want to explore this type of RP and compare it to other versions that they might be interested in, along with a list of the types of people that tend to enjoy this hobby and why. From there it would move on to finding a game and making an initial connection. There would then be a section on basic MU commands that would cover important things like talking on channels, posing, paging, @mail, etc. There would then be a section on MU etiquette/conventions.
Because, yes, we are a very hard hobby to start getting in to and I think that is what is keeping us from growing, even while RPing in general continues to be a popular pastime.