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http://whatmatters.mckinseydigital.com/, their "What Matters" page, currently has a focus on "Can social entrepreneurs create large-scale change?".

McKinseyDigital.com (in the non-premium section I've explored) seems to do a good job of taking a brutally pragmatic perspective on big issues, from mobile trends to micro-finance, etc. It's highly moderated/edited/refined, but in their case the result seems quite valuable.
Rank good ideas by "top rated" and "recent", but also offer a "stars" category which allows people to buy stars for placement (similar to bidding for Google AdWords placement).
Hold a monthly competition for best ideas in different topics, perhaps with cash or donation prizes.
Use GoodIdeas.org to generate good ideas for t-shirt slogans and then market them. Revenue can help support the site.
Does this database of good ideas make sense? Any suggestions?