In regards to your alias question:
From our experience, the search engines are going to index one of the domains and apply a ranking to that domain; the other will either not be indexed, or will have a penalty/etc assigned to where it does not rank well.
For instance, we setup aliases to allow us to setup an ecommerce store on a site prior to transfering the domain; we setup the store on a .net versus the live .com domain. Some engines are indexing the .com's and other's the .net's.
Based on this, I'd have to say that using the aliases is probably not the best option. Another redirect method should be used.
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