The Global Action Atlas, a new online portal from National Geographic, allows visitors to explore environmental, humanitarian, and cultural projects around the world with an interactive map interface. The site integrates social networking and provides a pathway for recruiting advocates, donors, and volunteers. Well beyond sticking pushpins on a map, this portal aims to "connect people and planet."
The World Bank offers a large data repository of economic indicators, statistics, and other useful tools for mapmakers working in international development. Users can search for data by country or by topic (Aid Effectiveness, Health, Poverty, etc.). In addition to viewing or downloading data, the site presents a nifty visualization tool displaying data on a world map.
Google mashup of preserves from the Nature Conservancy, with links to descriptions of various programs, parks, and preserves. Also contains links to Google Maps and Google Earth versions of the data.
The government of Victoria, Australia recently created a pilot project to allow visualization and mapping of data from the state government. This application requires Silverlight.
From the VisualPlace blog:
"The purpose of VisualPlace is to show the value of an interactive GIS-enabled service for the visualisation of location based government information."
The GeoBase is an online portal supported by the Canadian federal, provincial, and territorial governments, offering free and freely-usable topographic data covering the entire country.