COG stands for continuity of government. This is the overall set of procedures that can, in theory, enable the U.S. government to continue to function in a time of national emergency. At its best, that is. COG is also subject to abuse because there are really no checks and balances and it can be used to “temporarily” supercede the Constitution.  We may be living under a COG situation now which existed ever since 9/11.  Statements of some Congressmen, including DeFazio and Kucinich, strongly suggest this.

This is an excellent article explaining COG and describing its history:

By William M. Arkin
Sunday, June 4, 2006; B01

Peter DeFazio on the Alex Jones show talking about the lack of access by Congress to the COG plan

Excellent blog with many many links on the subject of COG.