Arthur Levinson, former CEO and chairman of Genentech (s dna), has resigned from the Google (s GOOG) board. He is going to remain on the Apple (s AAPL) board, however. Levinson, Apple and Google had been under fire for the presence of Levinson on the boards of both companies. His resignation is part of the ongoing (and rapidly escalating) feud between the two companies as they battle over the opportunities opened up by the mobile Internet. From what I’ve learned from my sources, there is a deep distrust of Google inside Apple, one that extends beyond the upper echelons of the company. I bet we’ll see more sniping between these two companies.