This one was a toughie to process... the reflected sunlight gave me a lot of noise, a bunch of clipping, and a banded gradient. Meh... it was my fault, really. I don't use a lens hood and I wasn't really thinking about the glare when I took the shot. That being said, I did the most I could with this and it's good enough for me :).
A couple people asked how I blend gradient banding in Photoshop. The process is pretty simple... in short, I selected the sky, created a new layer (via copy), performed a gaussian blur on the new layer to soften the transitions, created an "overlay-neutral (50% gray)" layer, added 2% uniform noise, and that pretty much did the trick. I couldn't rely on Picnik at all after I uploaded... the Flickr resizer is not at all gradient-friendly. The step-by-step is outlined here.