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I run a website about a popular holiday destination. One of the pages is about 'myDestination jobs.'
This page has PR5, has many internal incoming links and few externals, ranks 43rd in Google and 1st in MSN.
Frustrated at its position in Google, I registered myDestinationjobs.com last week. The site is just one page. I linked the page on the old site to this new site and that is the only incoming link.
I can't find this new site in MSN search, but it comes up 13th on Google. So, for the price of the domain name, for 'myDestination jobs' I have jumped from 43 to 13 in Google.
Hopefully with a few more incoming links I can make this new site popular enough to sell job listings.
Anyways, it looks like a site dedicated to a particular topic is more relevant than a page dedicated to a particular topic within a broaded website.
I don't get the logic of this - maybe you are just seeing a pre-sandbox effect. Anyway, if your original website is ranking well in Google; then it's not worth it to do it because it would rank well anyway.