Federal Acquisition Regulations (FAR), Defense FAR Supplement (DFARS), General Services Administration Acquisition Manual (GSAM) and others:

This is my favorite online source for FAR, DFARS, GSAM, etc:   http://farsite.hill.af.mil/  If you don’t have your pop-ups turned on, you’ll have to CTRL Click.

You can also find the FAR here: https://www.acquisition.gov/far/index.html and the GSAM here: https://acquisition.gov/gsam/gsam.html but the interface isn’t as nice.

And the Department of Energy Acquisition Regulation (DEAR) here: http://management.energy.gov/DEAR.htm

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Defense Contract Audit Agency (DCAA)

There is a lot of good information on the DCAA site : http://www.dcaa.mil/, and if your company is doing work for the Government, it’s really important to make DCAA happy! You’ll also need to be familiar with the FAR Part 31. If you’re lost (and it’s easy to get lost in the accounting and auditing stuff), the advice of a good accountant might be invaluable.

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D&B DUNS Numbers: http://fedgov.dnb.com/webform

Central Contractor Registration: https://www.bpn.gov/ccr/default.aspx

Dynamic Small Business Search: http://dsbs.sba.gov/dsbs/search/dsp_dsbs.cfm