I'm not really a fan of HDR, mainly because there are so many poor examples and because I think it is used too much and has almost become cliched. There are some nice ones here though, that don't look too unnatural. This was the last shot I did with HDR, which was actually a combination of grads and HDR.
And an earlier one that immediately made me imagine pteradactyls flying about. It was a sort of landmark image for me too, as it was one of the first images where I felt I'd mastered the lighting and used it for effect on the rocks and water.