Resolved: As of 2:12 AM EDT: For me, at least. This may be a fix that needs to propogate through Comcast's network, but for now, I can access my web site and my e-mail serves.
My web site, www.dougknox.com, may be inaccessible for some Comcast users. My hosting provider, www.pair.com reports that they are receiving a number of complaints that sites hosted by pair.com are not accessible by Comcast High Speed Internet customers. They say it doesn't appear to be their fault and are working with Comcast to resolve the issue.
Regards,
Doug