Many other forums of the right kind have their reviews or more like you are looking for collection threads. For example a chainsaw forum could have an archive thread where people post pictures, model info and serial numbers of their chainsaws. I think it is a great idea kind of like the encyclopedia of stops for digitals. To keep samples consistent I think there would have to be a preferred standard sampling method, basically a short easy to play sheet of music or single tones to play for demonstration purposes ideally all in very similar small file formats. There could be a few samples per organ, a collection possibly broken up into each stop one at a time with a short standard playing method, then maybe someone's own choice of demo music.