QUOTE(dtobias @ Sat 10th October 2009, 5:27pm)
In the case of Wikipedia, the only valid way to refer to it as a historical entity extending from 2001 to the present is as "Wikipedia" with no suffixes or organizational names attached, since the Wikimedia Foundation wasn't started until years later, and even "wikipedia.org" didn't become the address of Wikipedia until later than its founding (it was originally in "wikipedia.com" while owned by Bomis, and still often gets mistakenly referred to in this manner by ignorant journalists).
Wikipedia.org was bought the day after Wikipedia.com, and it was being used as an alias for the website by July of 2001 (
see archive.org), before the founding of the Wikimedia Foundation. According to my notes (
Wikipedia: The Timeline, which I have to double-check), the official switchover from wikipedia.com to wikipedia.org took place in August 2002, still nearly a year before the founding of the Wikimedia Foundation.
I think it's clear that wikipedia.org is referring to the website, not the domain name, though.