Today the New York Times reports on the use of the term "Web 2.0".
Squabble Over Name Ruffles a Web Utopia
by Sarah Ivry
O'Reilly, an American publishing group who also run tech-related biz conferences, claimed that the use of the term Web 2.0 by a non-profit IT conference in Cork, Ireland, was an infringement of their trademark.
See the blog by one of IT@Cork's organizers, Tom Raftery, for the letters from O'Reilly and their perspective.
And the O'Reilly Radar Blog has their account of what happened.