I found a USB 7" widescreen mutli-touch capacitive overlay for $158 from mouser and ordered it to see if it all works, well good news it does . It is made by Panjit and it is a eval kit with USB and I2C interface. I received it about 10 min ago and plugged it all in and Windows 7 automatically installed the drivers for 2 finger touch. Pinch to zoom in the browser works as expected and at this point that is all I have tried but the good news is it works great. There is a 85$ USB only model but it has a long lead time and a minimum order amount, maybe something MP3Car may want to look into. Anyway below is the link for the Eval and also other good news is they make other sizes including a 10.1".