This image shows some of the datasets published in the Linking Open Data community project. Clicking any of the datasets will take you to its project homepage. It is also available in PDF and SVG versions.
The image shows only datasets that are published as linked data and are interlinked with other datasets in the cloud. A more comprehensive list of available data sources is available in the project wiki.
source : http://richard.cyganiak.de/2007/10/lod/