A great infovis toolkit from IBM alphaworks (implemented in Java):
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Welcome to the alpha version of Many Eyes! View your data, ask questions, and share your discoveries. Harness the collective intelligence of the net for insight and analysis.
Something that seems to be equivalent to the python based universal feedparser in actionscript (from Adobe Labs, unfortunately as3 and not as2):
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as3syndicationlib ActionScript 3.0 library for handling syndication feeds. Use the syndication library to parse Atom and all versions of RSS easily. This library hides the differences between the formats so you can parse any type of feed without having to
A very nice custom layer for google maps: shaded reliefs