Lori,
I for one would like to thank you for all you do, and apologize on behalf of all the offenders. I realize how hard it is to keep track of a swap this big, and it sure doesn't help when participants are not cooperating. I say as a hostess, you have the right to just not allow whoever you feel is, umm, uncooperative, from participating in future swaps. Especially those who read your PMs and not respond. Hugs to you and do let me know if I can do anything to help you.