I am not sure that we need a specific thread for that. Threads of that nature seems to lose steam after a while when we force their existence. Perhaps a way to go forward is to somehow make it better known that the Photography Forum is here FOR constructive critque and to encourage members to take advantage of it. Better yet (IMHO) would be a forum/gallery dedicated solely to images posted for critique, but I am not sure how we would go about that. Another option would be to have some sort of eye-catching graphic that appears next to images in gallery when constructive critique is desired. Obviously the current notation for feedback is not given much noticed by most gallery browsers. Just thinking out loud here...

Kort Kramer - Kramer Kreations