The clouds where moving pretty fast. But with the Canon 7D, I set up the bracketing sequence to +/- 3 and used the high burst to be able to stop the clouds in their tracks. I read that you could snap just one RAW shot then manipulate the file to get three different (or more) exposed photos. But didn't have to with my camera. Plus, I was shooting high rez jpgs so I had to bracket.
These are essentially my first stabs at HDR. I took the three bracketted images into Photoshop CS4. File/Automate/Merge to HDR and viola! Almost done. Messed with a couple more adjustments and then boom! HDR doggy dog. I know my shots are not as sick as some of the ones I've seen but it's only the beginning.
Now, imagine shooting surfing, bodyboarding, SUP in RAW! Holy crap, I wonder if that's how Clark Little is doing his thang? Humm.