Fiona just pointed me to Visuwords a lovely visualisation of word association using WordNet data. The image below is of the word ‘human’ and you can see two clusters one corresponding to the noun human and one to the adjective meaning humane/caring

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Visuwords is Flash front-end and PHP backend. It appears to use some variant of spring and ball visualisation. You can download the source … so could use it as the basis of visualisation for other kinds of data such as web sites.