Mapping out the UN Millenium Development Goals is a great feature of this website. If you are not familiar with these goals and indicators, it is worthwhile to become familiar with them.
This is a global map viewer that includes many global datasets and images in a fairly intuitive viewer. I also liked that you can go to the Statistics tab on the left hand navigation Table of Contents, and you can see the UN Millennium Development Goal Indicators mapped. Very straightforward.
My impression of this site is "Data 2.0." I like that the data is organized by category, you can upload and download data, and it has graphing capabilities. It could be a little stronger on the mapping aspects, but if you find the data you are looking for here then it is worth it. Also, there may be social aspects to this site that I have not explored yet. Similar to the geocommons finder without the mapping component.
Resource for educators to link up with global collaborative projects. Fantastic international network of teachers K-12 whose classes are discussing global issues, social justice, and language learning.