I was on the edge of some precipitous volcanic rock, and there was a waterfall behind me. It fed this little area of rapids that emptied out into one of the fjords. There had been a light rain for a few hours, but the setting sun cut underneath the clouds to unleash some godly colors.
About 10-20% of my HDRs are in portrait mode. I am just usually in landscape mode for some reason. Part of it has to do with the way people consume these things -- on monitors. I don't like making people scroll up and down to see a photo. That's kind of a drag. That's another reason I don't like those super-wide panoramas. They are so difficult to pan around, even though there are a lot of slick tools. It's just not a "viewing" experience while you are busy using a tool to manipulate the photo itself. Do you know what I mean?
from the blog http://www.stuckincustoms.com