Works great on a dobro tuned to open D. Check out www.learningwithpat.com for the full lesson including tab & backing tracks.
Joe Wilson discusses pick blocking techniques for dobro. To view videos for all 12 pick blocking exercises, visit the dobro school at http://www.dobrojoe.com/pick-blocking-from-scratch.html
Video lessons, Skype lessons, and tablature for dobro at http://www.dobrojoe.com
Here is a free one for open D dobro beginners. For chord diagrams and backing tracks, visit http://www.learningwithpat.com