Just based on my experience, pages indexed in froogle are not blocked in the regular serps.
I posted the above on Dec 15th and I swear I jinxed myself! I have since noticed a sharp drop in ranking (generally from top five to twenty plus) for product pages that I included in my froogle data feed.
In the most glaring example two similar product pages - one included in the feed, one not - that previously ranked first with the second page as a supplemental result, only the non-feed page remains.
I realize that there could be any number of factors involved and this may well be coincidental; I should also note that not all pages seem to have been affected (though it is the majority and non-feed pages don't seem to have shifted significantly).