Thank you everyone for your comments. I really enjoy these forums and the ability to get feedback on photos - always nice to get more than one perspective on an image.
TheRoff - thank you for the comment about the tower; I was so focused on photoshoping other elements that it completely escaped my attention.
Stephen - thanks for the link to the tutorials!
I did a fair amount of work in CS3 on these images, and I think I was going for a bit of a darker feel to really accentuate the areas of light. Just for fun and comparison, I wanted to post the images the way they looked directly off the camera in RAW. I'm surprised that I got as much detail as I did in the clouds, because they are overexposed andthe hightlights are completely blown out (esp in #1).
[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.23.73/landscape1raw.jpg[/img]
[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.23.73/landscape2raw.jpg[/img]
[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.23.73/landscape3raw.jpg[/img]