Two very useful and often misunderstood techniques, incredibly useful for landscape photography. Both HDR and panoramas are "camera hacks" if you will, means of extending the camera's abilities beyond it's single-frame capability, and I've seen some clever uses for both, most notably shooting panorama-style and stitching to increase photo resolution (useful for phone photography but just as practical for a DSLR - you can never have too much resolution).

I've done a few HDR panos but this one from a storm in Colorado springs to mind because the bright band of sunlight on the horizon stretched the dynamic range of the scene past what I could acceptably recover from the RAW.