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If I search for my domain name in Google - I see links to ANOTHER SITE in the 'links to' and 'related' links.
I also have got the PR6 from that site. My domain has not been previously registered, but has been added recently to the index.
[sticky me for further info if required]
I've noticed that Google's serps are occasionally mixing up page elements. I've seen them display titles/urls from one page with content for another, even without 302s or redirects.
Saw it most recently a few months back. On one of a client's core phrases, we have a solid ranking for pages A and B, with additional results available for pages C and D etc. At some point, Google continued to show the snippet and cache for page B, but showed the title and url for page C.
I figured it was a GoogleGlitch, and it was... It persisted for about 8 weeks, and then reverted back to normal. In this case, I didn't worry much, because the pages were both on our site.
They link to you google crawls, they update constantly - by the time you check your site is long gone.
This may or may not be conntected with u, but it got me a little concerned.