After struggling for a long time on the best way (okay, a good way, anyways) to assemble the accumulated local wisdom, I've installed a wiki at http://www.windsurfatlanta.org/wiki
It uses the same software as Wikipedia, so it looks a lot like Wikipedia.
Pros:Popular format backed by large developer community. Short learning curve. Self assembles and categorizies information with minimal work. Integrates well with Google Maps. Fairly easy to upload media such as photos. Allows community collaboration ie we can all participate in contributing content.