I'm still working on this, but you get the idea.
As the directory approaches 100 locations, some patterns have begun to emerge: 1) whether it nets out is another story, but the invasion of giant national retailers brought MRCT's to the city. National chain stores top the YES list [museums and new public parks accounted for almost all the rest.]
2) Except for Starbuck's. They may be contributing to the vaguely public restroom inventory, but I have yet to see a single changing table in there. Then again, I'm not really Starbuck's people.
3) That's another trend: this list reads a bit like a travel diary. Maybe one of the reasons posting new MRCT locations has slowed is because I don't go anywhere else. If only Per Se was really one of my regular stops...
4) And the Close Enough category is the other big trend. The number of NO's was depressing (about 75%), but then I started seeing comments about couches and tables and such, and I realized that you can only manage so much idealism about changing a kid's diaper; sometimes you just gotta do it. So sofas--even in bars and a rare hotel lobby--will work in a pinch, but I drew--and draw--the line at changing a kid in the presence of other people or food. Or other people's food.
For some reason, only about a third of the entries show up at the moment, and it only seems to work in Firefox, so if you're a Google Maps mashup god, maybe you can take a look at my code. As soon as I get this version ironed out, I'll work on the downloadable GPS data. [fwiw, here's a pared down list of the locations posted so far.]