Actually, he has not been charged with anything–which is the point. He is being held without legal counsel and without due process for mysterious reasons that the administration refuses to divulge.
While I think Reeder is a bit alarmist regarding what the administration will do the the country, in general, their utter disregard of Padilla’s rights (while creating one or two fictions to pretend he is not a “real” citizen) should be cause for concern among even Bush’s supporters.