The sergeant stationed just west of Baghdad was once again recounting the dangers of being on the front line - sometimes with dark humor. He referred to how the "muj" (mujahideen or insurgents) were the gang that couldn't shoot straight, but still represented a considerable threat. "They're horrible shots," he wrote in an e-mail to his family, "but every once in awhile they get lucky. We lost another Marine the other day." This is the first war in which American GIs and military families can communicate freely and in real time via e-mail and cellphone, while gathering endless amounts of...