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Of course, my link didn't work.
To submit comments, you go to http://www.regulations.gov, and search for docket number DHS-2006-0030
You then click on the link in the search results, and can submit comments using a rather complex form system.
Or you can send snail mail marked with docket number DHS-2006-0030 to:
Homeland Security
Attn: NAC 1-12037
Washington, DC 20528