Weren't you supposed to list classes "currently enrolled" in on the AMCAS application? When I filled out he Memphis secondary last year the only thing they asked for were the classes you're planning on taking in the next school year 2006-2007. If you're not taking any classes at that time, then put your summer classes in that section. Other than that you could just leave them off. If you're just dying to list them then put them in the section that says "is there anything else you would like us to know?" They give you a few lines for that.