A word of warning regarding multiple domains.
If you plan to have two or more sites about the same subject make the content different. Changing the background colour or a few images, does not make a site different, you need unique text. If you can’t create unique sites, don’t make mirror sites, you might get your main business site penalized for duplicate content!!
If you MUST have two or more identical sites give the duplicates canonical URLs back the main site. A canonical URL tells Google etc… the preferred version of a webpage (they are page not site based). Every page of a duplicate site should have a corresponding canonical URL back to the main page on the preferred domain.
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