Doing research on the history of modern derby? While I do not keep copies of older versions of the roster, you can go to the Internet Archive and access snapshots of the list from as far back as May 2006! I originally published an Excel spreadsheet on my own personal website until it started getting bigger and I had to learn some HTML to publish a slicker version.
Here is the original version from May of the 2006-August of 2007 (use the arrows at the top to navigate through snapshots):
and here is the current address archive from March 2007 forward:
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Cat O'Ninetails