For a good overview of the complexities of the Afghan war, read "Stanley McChrystal's Long War", by Dexter Filkins, New York Times, 2009-10-14. It is intended for the New York Times Magazine, 2009-10-18.
Many Afghans would like to live in peace, but a corrupt government and a deadly insurgent force aren't helping them do so. Can a foreign force help them, or does it make matters worse?