About the OpenUru vs GoW indecision, here's how I see it.
Open Uru: The wiki doesn't really have much of anything on it and it seems many people see it as "one too many Uru sites to keep track of". It does have some people who I believe aren't on the GoW and it's focus seems a bit different: talk about OpenUru, rather than age creation.
GoW: It already has a large following of people who are building ages/writing documentation, etc. And it is an official organization by Cyan's standards.
Where the documentation end up all depends on who's making the documentation. If a member of the GoW makes a wiki page here about Cyan's plugin are they going to be forced to go make an account on OpenUru and duplicate the information? Since the GoW has never, and I don't think will ever hide information that it discovers on how to use tools for age-creation; I think it's the responsibility of the person using the plugin to come to the GoW for tutorials contributed to the GoW by its members.