What I've done - two things:
1. I've spoken enthusiastically about Rootschat to the local University of the Third Age Genealogy Group to which I belong, and I think a couple of people have signed up.
2. I have put a message on my webpage extolling the virtues of Rootschat, as well as the little Rootschat counter Trystan helped me with, so anyone visiting the page will hopefully get the message!
MarieC