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Interesting! This is a nice way to funnel traffic that we have already captured into our .ca domains, as well as build that interlinking between sites. Really want to capture that new Canadian market (For our e com Canada has some different part numbers as well as a different selection of products available to them)  Though i am still considering how to approach this, trying to avoid having much of the duplicate content across international pages.

Thanks for the info, ill do some digging.  Ill definately be writing up a YouMoz article based on the solutions tested, as they apply to SEO, gathering more hard statistics.