I realize my idea is fairly unworkable, but I was just hoping! I do think something like this could be added to TripAdvisor--at the very least, a "room selector" section for each hotel that asks reviewers "what room number did you have, and what did you like/dislike about this room?" It might be too much to ask for people to actually remember their room numbers for the review, but you never know--there are people who are awfully obsessive-compulsive about such things (e.g. FTers!) Maybe I can suggest it to TripAdvisor.

Meanwhile, I'll be starting my own list, adding to it whenever I get a particularly good/bad room.