An amusing observation. I was reading the TrackBack specification and came across something that I hadn't really thought about before. Here is the mime-type of the stuff sent to the server when you do POST from a web form:

application/x-www-form-urlencoded

Do you see that?

application/x-www-form-urlencoded

Yes, x for experimental. I think by now that format is little beyond experimental. Hey, I thought it was amusing.