Has any public CA ever had their certificate revoked?

[dan at geer.org]

No, but a few years ago I looked at all the certs in IE
and Netscape and found that about 30% of them were from
companies that were at that time no longer in existence.
The expiries on those where-are-they-now certs were often
as not three decades into the future.

N.B., if you are willing to take "no longer baked into
the browser" as effectively revocation, there is a
retrospective clerical job that might be a fun project
if you had some graduate student labor to assign.

--dan

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