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idiotgirl - 9:00 am on Sep 14, 2004 (gmt 0)
This is your business - not a hobby - and it may come down to a law suit in federal court to protect you from this kind of low-life activity. As is, your competitor could very well be costing you a fortune with nothing preventing him, legally, from doing so.
I know this is frustrating and costly for you, but if my business had a $250k advertising budget, I wouldn't hesitate to contract an intellectual property attorney for expert representation in the matter.