1. Read WhiteAfrican's great post on why Twitter's low penetration in Africa matters
2. The Importance of Bill Gates and Warren Buffett, by Tactical Philanthropy
3. PSFK's find: Camera for the Blind. I think more technologies for the disabled should be developed.
4. NY Times does an amazing graphic visual on Olympic game dominance by country, over the years. Its simply fascinating to see the evolution!