I found two different places where I'd mistyped my IP address when reconfiguring DNS for my domains (one was in DNS zone file, and the other was at the domain registrar (GoDaddy rocks!)) which had prevented me from being back in service probably a day or two ago.
So, I'm getting email again, and I presume our web sites are back online again. Even mail which was queued up at our ISP on their backup MX host is coming through. Yay!