Just like to add that once I watched the movie "Blood Diamond", I am all the more reluctant to buy Diamonds. Never know what you end up sponsoring.
http://www.survivalinternational.org/news/1872
http://www.survivalinternational.org/news/1915
http://www.boycottdebeers.com/
I like the way that these campaigns work, and there is another one I've been following more recently. It's been ignored for a long time, but it's looking like some good press could come off the back of another Holywood Blockbuster:
http://www.survivalinternational.org/news/5466
That's a British company. They recently recieved some major flak when the CofE pulled out as an investor citing human rights issues. But they have been allowed to get away with a lot of underhanded dealings for a good while, and it's just one I'd like to bring to people's attention.