Asynchronous Design Patterns

I'm learning about asynchronous design patterns in .NET and found David Hills article.

I will also be looking at the Asynchronous Application block from Microsoft Prescriptive Architecture Group (PAG) (lots of good stuff there - I use the Data, Exception, Logging, and Cache blocks regularly, plus the SQL Server 2000 High Availability whitepapers helped me a ton recently).

What other sample code/white papers/articles do you recommend?

Mike