working on an rpg engine

I've talked about MMO's for a while, and I've created simple rpg engines for XUL, Laszlo, Canvas, and even Konfabulator and I've always run into a "dead end" in that I've been creating this code for a very small audience. This time, however, I've realized that I can take what I've learned in those areas and create a good RPG engine using plain old HTML and Javascript - using the YUI utilities. This will be the platform which I use for my MMO as well as several other interesting projects. More news as it develops.