Using Context Properties Inside a Map (ContextAccesorFunctoid)

In codeplex we can download a very cool functoid, that allows us to use properties from the message context inside a map.

We can get the functoid in this link:
http://contextaccessor.codeplex.com

And here are some links that show us how to use it:

http://blog.eliasen.dk/2009/04/01/TheContextAccessorFunctoidPartI.aspx
http://blog.eliasen.dk/2009/04/15/TheContextAccessorFunctoidPartII.aspx
http://blogdoc.biztalk247.com/article.aspx?page=7a512419-d763-49e9-9e68-f9c59ff406c3