Projects that exemplify patterns

What projects should I read the source code of to learn great patterns?

The Hierarchy of Pain

Speaking at HDNUG

Tonight I’m speaking at the Houston .NET User Group, my talk is entitled “Black Belt MVC” and covers a lot of interesting framework minutia about ASP.NET MVC. You can find the details about the presentation here : http://hdnug.org/events_view.aspx?eventid=99