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The PR flowing through will be divided by the total number of links on the page (not necessarily equally), regardless of whether they are internal or external. I have seen various articles suggesting that maybe external links "could" receive more worth than the internal ones but it's hard to be sure. I can say that the 3 links would not get a third of the total PR in your example, the internal links would dilute it.

Rand mentioned using cross-site canonicals at the linklove event in London, perhaps some of the SEOMoz staff have some data on that kind of usage that they could share? (particularly with respect to the how closely content needs to match from page to page).

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