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2. Would it be better if i create a unique content site for each of thise 20 - 30 domains and do linking to my original site?
[edited by: Receptional_Andy at 3:02 pm (utc) on Nov. 21, 2009]
[edit reason] No specific keywords or industries, please, see charter [/edit]
It seems like it would be a great deal of work to create a site of value in each of 30 or so cases, but if you think you could crate sites that Google would rank independently, then that would be the way to acquire the biggest share of your target audience. It's difficult to see how you could create so many sites of value though.
Not all the back-link value will transfer - it seems to be around 80% to 85%, at a rough guess. And in some cases it may take a long time to see the old link juice kick in for the new domain, especially if there is something about the redirects that looks strange to Google's trust routines.