When signing up with Dreamhost, use the following codes to add free stuff to your account or simply save money.

GET FREE STUFF:
CNH001 - 50% more disk space
CNH002 - 50% more bandwidth
CNH003 - three more free domain names
CNH004 - one free unique IP address

OR SAVE MONEY:
CNH005 - no set up fee on the monthly plan
CNH006 - save $45 with the yearly plan
CNH007 - save $45 with the two year plan