This is a project I have been working on for a while now, and I have been working on the idea (a graphical MOO environment) for almost 8 years now! It's a live, two way, asynchronous web page; a web page that never has to refresh the entire page, either to send data to the server or for the server to send data to the web page.
Of course, the same thing is possible in Flash with the XMLSocket object; in fact, the first actual implementation I did of a MOO client in a web page used a small Flash movie as the inputline/output controller. But this version requires no plug ins; is fairly cross browser compatible; and works great!
See the output of LambdaMOO in a whole new light!