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Re:Ask HN: Share Your Pain by erpa1119 on Wednesday July 04, 2012 @12:45PM (#4200016)
A way to explore pain points by industry:

Ideally a website where domain experts can share their business and industry pain points with a community of developers, entrepreneurs, etc. for us entrepreneurs to explore, give and get feedback.

Re:Ask HN: Share Your Pain by tissarah on Wednesday July 04, 2012 @12:53PM (#4200052)
http://news.ycombinator.com/item?id=3664769

also there are quite a few pain point threads if you run a quick search