I don't usually see locked threads, and when I do it's usually pretty clear why they got locked.
However I'm very puzzled why this thread got locked, so hopefully one of the moderators can help me understand:
http://www.teamfortress.tv/28738/color-values-for-yellow-crosshair#16
It started with a simple question, which was answered, and then there was a wider discussion about picking colors and different ways they get represented.
I guess I could see how some would see the extended discussion as off topic, but it absolutely fit into the starting question and I thought they were genuinely interesting replies.
Based on all of this I can't fathom why the thread was locked, so could someone enlighten me?