I have just put up a site and bought a few different domains for my main market to point to it.


as well as basilisk.eu and basilisk.pl

The easy way to direct all of these domains to the same site was to simply point them there via the C-Panel on my host.

My friend now tells me that I will get penalized by Google for duplicate content and that the better way to do this is via a 303 redirect.
Is this really the best way? Is Google still that fussy that they don't see I just want a simple way to use multiple domain names for identical content? A 303-redirect seems to only add a layer of complexity, hassle and slowness to the mix.