everybodywave's project page. Below is a collection of Google Wave extensions (gadgets and robots) that I have developed, as well as other concepts that you may find to be useful.
"Requesty is a Google Wave Extension that makes it easier for you to create public waves without worrying about unwelcome users, such as trolls. The idea was first described in Robot Idea: Requesty. It works by adding a gadget to a public read-only wave that lets anyone require access. The wave owner, and only the wave owner, can review those requests, approve or decline them. When a request is approved by the wave owner, Requesty will add the user who made the request to the wave. That user will then have full access. See this wave for a live demo."