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Re:Wikipedia Raises $16 Million to Remain Ad-Free by sorbus on Saturday January 01, 2011 @05:55PM (#2058717)
500 thousand times. 16 million dollars donated, but only 500 thousand donors.

EDIT: Paragraph wondering about A/B testing removed, as two people responded with links to the results of A/B testing, which I was not previously aware of.

Re:Wikipedia Raises $16 Million to Remain Ad-Free by rwwmike on Saturday January 01, 2011 @06:01PM (#2058737)
Re:Wikipedia Raises $16 Million to Remain Ad-Free by figure8 on Saturday January 01, 2011 @06:00PM (#2058732)
blog.jess3.com/2010/11/wikipedias-crowdsourced-ab-ad-testing.html