Gnod is an interesting website. It presents a visual way of organizing relationships between music artists and their listeners. For example, this search shows what bands listeners of Fischerspooner are likely to listen to, and clicking on any one of the other artists (say, Depeche Mode) will re-arrange the links and cause new band names to 'emerge' (I couldn't help myself). Sort of reminds me of the early experiments done by Plumb Design with their visual thesaurus.