This image was taken two weeks ago in Eldorado Canyon State park (for earlier pictures from the same outing see here and here). This was quite a while after sunset while I was walking back to my car and the yellow trees were positively glowing.
Blast. Buy a print.
Boring technical data: Nikon D300, Tokina 11-16 mm at 11mm, ISO 200, f/11, 8.0 seconds. Two different developments in Lightroom of the image were combined in enfuse to balance sky and foreground.
Same image on Flickr. Google+ post.