I used CS5 and Content Aware fill to dispose of the branches. Then I adjusted the mid-tone contrast. Of course what you have on Flickr is a JPEG, not the Raw file so this was a JPEG edit. Because the photo is mostly underexposed, any editing will make the image noise more visible.
Or use the other tried and true landscape shot procedure, and make 2 exposures. One exposed for the sky and one exposed for the foreground, them blend the 2 post process.