Mobile Entertainments website has up a Mobile Video Buyers Guide which I happened to come across posted in June, I think.
http://www.m-emag.com/VideoBG/

Good to always skim across to see who's got what. Of course, the majority of these are NTSC, however I did see some of the 12in. units listed with 640x480 resolutions.

Now, if somebody would just offer reviews/comparisons on some of these screens, life would be much better.

The logic behind not listing contrast ratios or nit ratings on a normal basis is beyond me.