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Turns out that the front page had been accidentally mangled by the webmaster and it didn't validate properly (missing head tags etc) - hence the PR0. It still displayed properly in IE and NN... hence the problem wasn't spotted for some time.
I can't believe that we used to argue here about whether Google ever influenced the Yahoo search results. It seems pretty obvious now! :)
...most of the time when a listing looks good but doesn't rank, take a closer look at the cat you are in, compared to others in the SERP.... you won't be able to change it, but at least you will know why it didn't work.
(...that said, I'm talking about sites which have already settled... not new sites just submitted)