I should also note that my above reply is somewhat contentious among SEO "experts"...
Some people think that it is better to duplicate content with multiple domain names and then use the canonical meta tag to point back to your main site, i.e., on the secondary site pages add a meta tag like so:
<link rel="canonical" href="http://www.mainsite.com/whatever" />
Personally, I think the major engines are smart enough to determine duplicate content regardless, but I thought I'd throw it out there.
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