Update
I think the problem has been resolved, although it may take 24 hrs or more to fully propogate to all the name servers around the Internet.
Turns out there was an error in the DNS zone file for the "master" DNS server for the sites. The error has been corrected and I'm now seeing all the correct info when I do nslookups.
Sorry for the problems. Those records were set up automatically a few years ago and I wasn't aware of any problems until LivingtheHL mentioned it. I'm surprised it didn't cause more problems much sooner.
I still recommend using OpenDNS. As Pepper noticed, it really speeds up your surfing and gets around many little DNS problems.
Thanks to everyone who helped us work our way through this.
Don
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