FYI, I've created (and recently released) something I call "XMPP Bridge". It is basically an XMPP bot, written in Ruby using XMPP4R, that allows users to connect to local and network accessible text-based apps and servers. This includes MUSHes. When you issue the bot a command to connect to a MUSH, it opens a TCP/IP session on your behalf and then "bridges" all traffic between your XMPP client and the remote server. Currently it can only support simple text, so you aren't going to get any of the fancy graphics or colors, but it is yet another way to allow users to access a MUSH. And there are a HUGE number of users on GoogleTalk, stuck behind firewalls...
For more info you can see my write-ups on it (with screenshots) at http://www.stevegibson.com. Or if you just want to check it out from your XMPP or GoogleTalk client, I always have an instance running at email@example.com. Just add that Jabber ID as a contact and send it a chat message containing "!help".
And before anyone asks, no, I'm not THAT "Steve Gibson". ;)