Tagging resources with keywords

Tags associate a single keyword with a resource. However the interesting aspect is that you use collab filter to do grouping & sorting.
Seems to have been derived from WikiWords so that you only get one token. Seems a bit like NP agglomeration from German...

flickr.com - tags for images
del.icio.us - tags for general urls
citeulike.org - tags for papers

citeseer fixes - az from simone, coupled with citation type analysis (how much cited).
push alerts - based on phrases within papers, based on phrases in others papers.

Automatic profile creation. How? Based on papers, home page, collaborators pages?
how to do query / tag expansion -- based on collab filtering again?

searching for tags? does this make sense? certaintly doesn't scale. how would people search or browse? based on profile?

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