That is a good photo to tag, and I look forward to seeing it again in the image sets (hint hint). Your suggestion strikes me in a couple ways -- yes, it would be great to have tags on photos in any forum, but then I would likely miss some really nice scenes posted in forums I am not active in. When I go to the image sets, I am pretty much assured that I will have lots of beautiful landscape ideas to ponder, although there do appear to be some single plant photos posted there as well. Not sure if those will be re-directed or left alone.
