Our registrar apparently decided to suspend our domain because the email address they had in their records wasn't correct. Never mind the fact that there was another, valid email addy there, or the fact that their tech support guy insisted that the problem was a technical issue with DNS propagation... which is why it took a day to get to the bottom of the problem and get it resolved... But anyway, things are back to normal, and I apologize for the inconvenience.
No problem, and thank you, Bruce and the others for keeping this great source of information going! Abner