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[edited by: tedster at 8:10 pm (utc) on Apr 17, 2010]
at least I've seen websites with no "obvious" inbound links that still have PR-3 or PR-4 for some of their pages.
search in public SERPs. Check again using Yahoo SiteExplorer too.
I have found Google WebmasterTools but I am not sure I want to use it.
I have so many sites that doesnt have back links but has a good PR because of the content.
If you're talking about Pagerank, it has nothing to do with on page content. Pagerank is 100% links.