One thing ive never been 100% sure on is weather having more than one domain pointing to one site, before it hasnt bothered me but after checking copyscape today one of the domains that i have redirected to the main site has come up, now i understand why its there but im just wondering weather the SE's will see it as duplicate content ? whats your views on this ?
If you promoted more domains for one domain, and you get some duplicate content, you just started a "google dance", full about penalties and SERP strange modifications