31 Dec 12 2:53 pm
If I'm not mistaken the search engines will eventually drop the sites that you put the forward onto, and sort of treat them as a change in address to the one main site, I could be wrong on that though. Plus if you stop building those site's content/links then they will drop off anyway.
If the contents on the sites are all the same yeah all but one will get filtered out.
I think it's best to focus on one site at a time, work on it till it's completed (or has failed, sorry for the bad imagery here lol), then move to another site/niche. If your going to add content to a site why not make that content exclusive and awesome.
If you focused just on one site by forwarding all the other duplicates to your best one, you'll end up with one login, one theme/template to mess with, one URL to send links to, and one brand to build, it would be easier to handle, in my opinion.