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Any info on this?
It may not be very helpful as we didn't really come to any conclusions, but you may like to know that sections of sites do appear to be penalised sometimes.
Like Mil2k says though, PR0 is not necessarily a penalty (may be just be PR of less than 1, or less than 0.5 if Google rounds figures fairly)
I'm certain that portions of dmoz.org have had penalties for linking to bad neighbourhoods (or by using a word that Google didn't like at the time). So yes.
If you have a bunch of very similar pages, then I think that Google is more likely to merge them than penalise you.
I suspect that it has more to do with the site structure, or even timing.