Hey all,
The postgres port should be fairly usable right now. There are some bugs left. We know about some -- particularly, uploading files does not work (I am looking at this right now) and forums permissions are a bit screwey (viewing forums does not work unless you are the sitewide admin).
Please play around with it and let us know about other bugs you find. Doing an update every day is a pretty good idea right now. We're working pretty hard to squash the few remaining bugs.
