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Lorel - 4:02 pm on Mar 8, 2005 (gmt 0)
When I'm having a duplicate content problem with a site being copied by a competitor soon as I get a new page online and indexed in Google I make a copy of it with Google's cache (which has a date on it--hopefully an accurate one) with my browser and save it in case i need it. Then you have a 3rd party witness as to who was the original author, i.e., Google itself. And every time I update the page I do the same in case it's copied after the update.
If I have a page that has not changed for some time then Google could assume that my page is the original as opposed to the hijackers' pages.