Is this (From the beginning of this post) still correct for multiple boards?
If you want more than 1 board, using the same membership system, with a single install:
1. Each board will exist in it's own subdirectory, ~/forum1/ and ~/forum2/.
2. The YAF web.config settings will all be in the website's root web.config EXCEPT for the appsetting keys. Each forum subdirectory will contain it's own web.config and app.config file.
3. Each forum's web.config will look similar to this:
4. Each forum's app.config will set it's own BoardID, the Root key to the forum path (~/forum1 or ~/forum2), and will comment out the BaseUrl key.
5. Each forum subdirectory will contain all the folders/files necessary for YAF (controls, pages, resources, etc) except for BIN and APP_CODE, which will exist in the root of the website.