Interesting. When I dealt with the problem of wanting to give people access to my MU* through a web-browser, I worked around the problem by building an ANSI-aware bridge between the existing MU* and the browser.
This client is what I think of in my minds eye for a modern day MUD that still stays true to what a MUD is but has an accessible interface. Whoever designed the UI did a nice job.
That looks interesting - is this a mud client of custom browser-based game?
DuckClient/Wedgetail also exists for this purpose.