Thanks for the quick reply.

There seem to be a few 3.5" and smaller displays, with 320x240, or even better resolution. It would seem that it would be not much harder to make a 5.7" version. I guess there is just not a large application out there demanding one yet?

I might consider getting one of these to fool around with, but to replace my existing display, I'll need something larger. The 5.7" is just about right, and there seem to be about a half dozen or so manufacturers offering them, in both TFT and CSTN, just none with an interface that I'm comfortable with.