Hi,
I noticed about 6 months ago Trust we're going to release a true 1.3mpix USB 2 web cam, they cost £22+delivery, so I put one on back order, I got it today and appart from some hot pixels it does stream at 1.3mpix at 15fps without compression. The chip is about the size of my ToUCam so I think the resolution per pixel is going to be quite good.
Here's a sample stack using registax 4
(http://www.deep-sky-photography.com/Trash/test.jpg)