Jon Udell's graphing of 'link affinity' he
shares with 6550 del.icio.us users (Collaborative
filtering with del.icio.us) hints at 'a mixture of shell
scripting, Python scripting, regular-expression pattern matching,
and XML parsing' to 'identify an implicit community of interest and
tap into its emergent group mind'. He promises to publish the code
'[o]nce things settle down'.