Likely my favorite iPhone Dev book has been updated and a 2nd Edition has been released. The Big Nerd Ranch books name was appropriately updated from iPhone Programming to iOS Programming.
Big Nerd Ranch – iOS Programming 2nd Edition – Amazon Link
Not really a iOS specific programming book, but Stephen Kochan’s book has been updated and a 3rd Edition has been released.
Stephen Kochan – Programming in Objective C 3rd Edition – Amazon Link
