There's a new website that features intelligent commentary on localization, community, sustainability, and other issues that are frequently brought up here. I think that PO-ers would find it worthwhile to check out. It's called "Front Porch Republic." It's not for doomers or survivalists though as its overarching message seems to be a look at what we have lost because of liberal modernism and how we might reconstitute "traditional" communities.
http://www.frontporchrepublic.com/