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people accessing site.com.uk would end in your site.com and so on...
May that be considered spam or not SE friendly?
Check the header status of the parked domain. Is it returning a 302? I don't recommend 302's. That tells the spider to maintain the requested URI but redirect to another temporary URI. It will continue to index the original requested resource (the parked domain).
I recommend a 301 Moved Permenently status for all parked domains. This way they don't get indexed and everything transfers to the redirect target.
I've even seen parked domains returning a 200 OK status. Ack! Let a competitor find that little mistake and bam, issues await you. In the past I've seen Google index whichever domain has the most PR or links pointing to it. All a competitor needs to do is link to that parked domain from a group of their properties and next thing you know, your main site is gone and the parked domain is in its place.
It can turn into a big mess so be careful with how you implement it.
