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[edit]to answer the rest of your question - I didn't really try to make that page have high PR. It happened without my intervention[/edit]
Actually, I know one very large commercial site where the home page is PR6, and one internal page is PR7. This came about because this internal page links to a lot of subsections, and these subsections link back. Because this site has a number of links from other sites to subsections, the home page is not the one with the highest PR.
BTW the linked page is on-topic and not my site so hopefully it doesn't get <sniped>.