I've been working on replacing the sky in this photograph I took of the entrance to the Great Lakes National Cemetery in May, 2008. I found a tutorial on line that I like and it made the process pretty easy. I just don't think I have the blue quite right yet. I downloaded some cloud brushes from the Adobe Exchange to add the clouds. If anyone is interested, you can find the tutorial on retouchpro.com at http://www.retouchpro.com/forums/rp-tutorials/13348-fixing-blown-out-sky.html

Here's the original photo with the blown out sky.