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eg: somedomain.com / somedomain.co.uk / some-domain.com / some-domain.co.uk
With the site content being an exact copy.
Is this good / bad or very bad?
I suspect this will help people who may mistype the domain but would'nt webforwarding be just as good + safer regarding SE (spamming)
I treat re-directs like road signs. Your instance is like pointing to the same "town" by going down three or four different roads
IMO search engines dont like this, the only reason for you to do so (if you created this from scratch) is to artifically gain ranking and recognition :)
Im guessing that as long as you submit one, and only one domain is promoted it should be ok otherwise but im sure someone else in here has more experience on this matter :)
im a single domain/single site sorta guy