Both the membership back at PCF and ChipDonkeys.com are generally against joining for various reasons, although there are a few of us that are active in those communities who are also CCA members.

Navigation there is actually pretty simple. Content is grouped by category. The search function also works well if you are looking for specific content. All direct sales, want ads, and links to eBay listings are segregated into their specific categories so that they don’t clutter up the rest of the listings.