Seems that their Network Solutions account may have gotten hacked. The WHOIS shows:

Registrant:
Comcast Corporation
1500 Market Street
Philadelphia, PA 19102
US

Domain Name: COMCAST.NET

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Learn more at http://www.NetworkSolutions.com/
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Administrative Contact:
Domain Registrations, Comcast [email protected]
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PHILADELPHIA, PA 19103
US
4206661870 fax: 6664200187

Technical Contact:
Comcast Corporation [email protected]
1500 Market Street
Philadelphia, PA 19102
US
215-320-8774 fax: 215-564-0132

Record expires on 24-Sep-2008.
Record created on 25-Sep-1997.
Database last updated on 29-May-2008 00:17:01 EDT.

Domain servers in listed order:

NS21.WORLDNIC.COM 205.178.190.11
NS22.WORLDNIC.COM 205.178.144.11