Sort of a follow on ... right now the flow is:

  1: click a button
  2: select a user name
  3: join a room

You could eliminate step 2 (see, e.g. http://etherpad.com) and defer the choosing of a username until later. That would make it even easier to use.

Also, there is a display bug where you try to join a room w/o picking a name first - the message (Name cannot be empty) overflows the lightbox.