OpenLayers

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Get flash to fully experience Pearltrees
http://webtools.ec.europa.eu/road-maps/examples/index.php?page=readme-first.html Embed a map in your website

Interactive maps with OpenLayers examples

Online Maps with OpenLayers

http://archive.p2pu.org/node/12927/document/27689 The next step after mixing and matching different layers is making some of your own.