How to implement dll hotswapping?

I need to create a program that can load dlls, execute their code and then unload them again, so new versions of the dlls can be used instead at a later time.
The program needs to be able handle several threads (possibly many) at the same time, each executing code from any one of the dlls (never more than one).
It's fine if a dll can only be swapped if no thread is executing its code at that moment, but I was not able to achieve that looking around for a lot of examples on the internet.

This search returns several complete examples of how to do this:
http://www.bing.com/search?q=plug-in+appdomain+marshalbyrefobject
David
David http://blogs.msdn.com/b/dbrowne/

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