I found it very interesting to see that surface charge and the Poynting vector are being used to describe how a simple DC circuit actually works. Chabay and Sherwood have made an outstanding contribution to physics and engineering in their texts and papers. Of course others jump on the bandwagon and rightly so with a plethora of papers in the last 15 years. We were not taught those truths back in 1970, a shame. Regarding the use of the Poynting vector to show power flow is not mainly in the wires most of the authors of recent papers neglect to mention that John Kraus in his "Electromagnetics" did indeed illustrate this. I know it is in his 2nd edition, 1973, pages 416-419. Unfortunately I didn't have his text but took E&M using Reitz and Milford and if it is in there its buried somewhere.