Congratulations Dave! A worthy winner... and there's a lot of good panoramas in there to compete against! Well done everyone.
One of the biggest challenges with panoramas is managing exposure, especially the dynamic range across all the images. Its easy to overexpose the sky somewhere for example because the exposure is a compromise. Avoiding that overexposure is one of the things that sets a great panorama apart from a merely good one. Just a little tip if you're new to panoramas.
Al.