Here are some basic links to defense procurement websites.
Legislation
U.S. Code (LII Cornell Law School)
U.S. Code (GPO)
U.S. Code (House Law Revision Counsel)
THOMAS (Congressional)
Procurement Policy Documents
OMB Circulars
DoD 5000 Series
Defense Procurement and Acquisition Policy
Defense Agency Contracting Sites
Defense Acquisition Portal
U.S. Army Contracting Agency
Air Force Acquisition
DoN Acquisition One Source
Missile Defense Agency
Procurement Regulations
FAR & DFARS
Search the FAR and DFARS
Federal Procurement Regulations, * 48 CFR (2010)
Federal Procurement Regulations, * 48 CFR (2011)
Status of Open FAR Cases
Status of Open DFARS Cases
DFARS Cases Out for Public Comment
Protest Decisions
COFC decisions
GAO Protest decisions
Contract Disputes Act Decisions
COFC decisions
ASBCA decisions
CBCA decision