This is fun: Visuwords.
Visuwords™ online graphical dictionary — Look up words to find their meanings and associations with other words and concepts. Produce diagrams reminiscent of a neural net. Learn how words associate.
Enter words into the search box to look them up or double-click a node to expand the tree. Click and drag the background to pan around and use the mouse wheel to zoom. Hover over nodes to see the definition and click and drag individual nodes to move them around to help clarify connections. [continue, go play]
(Requires Flash.)
Found here at Metafilter.
Thank you, good link. I’d like word associations as they help me in the learning process. The was an on line dictionary that would create a tree-like map of the words. Still, the visual tool is way better. I’ll write a post on it, others might find it as useful.
Fede