NamedGZipStream, Covariance and Contravariance
Favorite MSDN article title of the month: NamedGZipStream, Covariance and Contravariance.
That's Microsoft, as always, blending the sublime and the ridiculous.
(Thanks also for the bogus etymology of "covariance": "In mathematics, covariance is a measure of the degree to which two variables move up or down together. The term was co-opted by the OO crowd to describe..." Way to overlook category theory, guys!)