The main user database is here -- this is the umbrella site that links all others together. I see it also being the repository for regional-level information.
Several different types of directories. One is the user directory or social network proper, where you can browse/search/connect with other users based on their interests, skills, regions, COIL participation, etc.
Another directory would be a listing of all COILs, filterable by region.
Directory of meetings/activities, by COIL and region.
Directory of resources? What are resources? Tied to COILs (yes), tied to regions (yes)?
COIL, or community of interest, is dedicated to a particular subject - e.g. wind power.
Links:
[1] http://li326-157.members.linode.com/technology
[2] http://li326-157.members.linode.com/content/bryght-releases-foafmodule