I am no expert but from what I understand parket domains are used if you have more than one domain that goes to the same place.
If you have mysite.co.uk and mysite.com you wouldn't want two seperate sites with exactly the same thing on them theres no point, but you may want people to go to your site regardless of whether they type the .com or .co.uk.
You could set one up as a parked domain and redirect the parked domain to your main domain (or the other way round)
Or if you get a new domain and want your old site to go to the new domain you can park your new doman and set up a redirect for your old domain.
I believe you should look at which domain the spiders are indexing but other than that, as far as I know it makes no difference SEO wise - like I said I am no expert but thats my understanding of them.
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