Cogent/Leve3 reconnect peering...
 

Cogent Network Status/DNS Server Status Description:
Date: 10/07/2005

Update (3:40pm edt): Level 3 has restored some of their peering sessions with Cogent at this time. We do not know if this is a temporary or a permanent change, and will continue to negotiate with Level 3 to resolve all the issues they have with Cogent.

http://status.cogentco.com/

looks like comcast put them back on as well