Conservation International.
Conservation International is a website trying to raise funds to protect rainforests. They market this really well by giving recognition to individuals that have donated, they even show the donater and others the acre(s) that they have helped save.
The design is very minimal and also very strong. It has a White background which gives a very strong contrast. The colors are Green, Orange, Black and White with various shades of these colors.
The designers main tool was Flash and have made the navigating or "exploring conservation" very interactive and fun. They use imagery that invokes strong emotions and the colors are very active but at the same time non-obtrusive.
If I were to change one thing it would be the layout, perhaps increase some of the spacing between certain elements.
