I think this new "Gypsy Fire" book by Andrea Oberg is really excellent. I would highly recommend it to anyone, particularly as a follow up to Michael's Gypsy Picking book. In both cases the information is concise and extremely practical. They've done the work of boiling it down to some of the most important essentials. We all know serious motor skills take years and years to build, but these books do facilitate some pretty inspiring short term results.
We could all use some of that!