Heh heh, I just rewrote that page the other day (talk about good timing), and the format in which it is in makes it easy to reuse as a FAQ here.
Anyway, I agree, we can use parts of the wiki to make FAQs. The FAQs should also be customized to each individual board. For example, the FAQ on the Mods board could contain frequently asked questions about mods and installing the mods, as well as link to some important topics, while the FAQ of the general discussions board would answer mostly general questions such as board rules and stuff like "who created Glest". Tools board has one, which is about the tools used to create mods and commonly asked questions about them. So on, so on...
I think most of the boards have FAQs, not sure if any are missing some? The announcements and off topic boards don't really need FAQs.