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I'm not sure what the Google folks think about it but from a 'useful site' point of view I think outbound links to resources and further information add value.
It shows a certain authority on your given subject. I'd not limit myself to 2 per page. In fact I'd not try to fill that quota either. Instead I'd concentrate on what adds value to the page you're writing...
Just my 2p...
As for outbound links helping your PR - thats rubbish IMHO no way but.. they probably give you some on page relevance boost which is most likely going to do more for your SERP's than PR.