Well, it may not be perfect, but for a point and shoot, this is the closest thing I've seen. Its the new Fuji F10 camera. I know a professional that has this camera and loves it! The thing that would make it ideal for a backpacker is the fact that it has an ISO range from 80-1600 !!! This is quite a feat for a point and shoot. Not only does it have this incredible range of iso...it manages to do it with very acceptable noise at all levels. The noise at 800 iso is very clean and at 1600 iso, its very acceptable. Backbackers on the AT are frequently in low light situations and this camera would really shine.
In addition, you can take 640x480 movies at 30 frames per second...limited only by the size of the xd card. 640x480 is good enough quality for a home movie...maybe even a small documentary if your talented.
Check out www.dpreview.com for a very impressive review of this camera.
Whats also impressive is the price. It can be had for between $300 and $400 dollars!