I have set up a permanent test group chat room on the Flash Platform community chat server. This can be used if you need to test your chat client, or if you are building an XMPP / Jabber client and need a remote room to test on.
Here is the info:
Server : mikechambers.com
Port : 5222
Room name: test
Server : conference.mikechambers.com
You can find more info on the server here.