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"PR 2, no inbound links, ranked #3 out of 571,000"
I don't think it is a fluke! This may imply that their actual PR is not PR2, but more - only that Google Toolbar will show the actual number later, normally after the Google Dance.
If you are checking that site's PR and its ranking today which is only the 2nd day of Google update, you should be aware that Google Toolbar still has NOT shown up its update PR yet. Perhaps a week later, you will find that the actual PR of that site could be 4 or more....I bet this would be true!
I fully understand how sites get PR! - my point was that it is possible to have a high PR with very few external links. Only one external link to my site has highly relevant anchor text.
My PR increased to over 5 due to a *single* link from a high profile site.