Greg Weeks, who runs a blog on Latin American politics, has been all over the situation in Honduras. Apparently, "U.S. aid is contingent on whether or not a coup is a 'military coup.'" The U.S. is waiting until Monday to decide whether to cut it off entirely:
My first impression is that this could very well ease Zelaya's arrival on Saturday. It is a public warning that aid may well be suspended if things go badly over the weekend. Like if the Honduran police tackle Cristina Fernandez and Rafael Correa in order to grab Mel Zelaya. It is also a signal that the U.S. likes how Zelaya has responded thus far, and expects Micheletti to be nice too.