Understanding Covariance and Contravariance in C# 4.0

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You may want to look at this blog, he does a fantastic job of explaining it, but I think it will take more examples to clear it up for people, as this gets into a very hard-to-understand area, but, the quote below from the article sums it up well.

http://hestia.typepad.com/flatlander/2008/12/c-covariance-and-contravariance-by-example.html

“covariance and contravariance” means
that you can now pass inexact generic
types when it’s safe to do so, just as
you can pass inexact argument types
when it’s safe to do so.

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