The U.S. Government maintains current (and past) versions of the Code of Federal Regulations at: http://www.access.gpo.gov/nara/cfr/cfr-table-search.html#page1

The current (April 2009) GMP regulations for Drug Facts labeling are at: http://edocket.access.gpo.gov/cfr_2009/aprqtr/pdf/21cfr201.66.pdf