Taxonomy described via MetaTag-s
see also Folksonomy - a Tagsonomy isn't necessarily a Folksonomy - the latter must be applied across a sufficiently large Critical Mass of users to allow convergence via Emergence.
The tag is the soul of the Internet.
Tags Vs Free Text
Who gets to tag?
Anyone (even anonymous)? Any registered user? (Folksonomy) Or only the "owner" of an item?
slower.net turned off tagging
FlickR lets you tag other people's photos
Del.icio.us of course lets anyone tag anything
what about when there's E Commerce at stake? do you let your competitors tag your stuff?