Just leaving Stoke-on-Trent (at Endon) on my way to Leek and the Peaks, a wonderful sky persuaded me to stop and try to capture it. This is my best attempt, which not great does show the sky.

Technical Data
Camera: Nikon D300
Lens: Sigma 18-50mm F2.8 DC MACRO EX Lens
Focal length: 18mm
ISO: 160
Aperture: f2.8
Speed: 1/13, 1/25 & 1/50 sec
HDR: NIK HDRPro from 3 images
Processing: Photoshop CS5
Filter: ND Grad

Please feel free to critique or question any of my work. It is often the best way to learn.
Also if you see any technique you wish to question/discover, then feel free to ask.