Capturing the multiple exposures used to create great HDR images requires careful planning and the right equipment. A good ball head sitting on quality tripod legs can make all the difference when the slightest camera shake can ruin a series of exposures. The folks at Really Right Stuff make the best ball heads and arca-swiss style clamps I’ve ever used and they’re real nice people as well.
The unit shown below is their BH-40 LR (BH-40 head with B2-40 LR clamp). It fits perfectly on my Gitzo Traveller tripod legs and keeps my Canon 40D perfectly still when taking multiple exposures. It’s also a great ball head for basic pano shots as well.