Spring.NET

"Spring.NET is an open source application framework that makes building enterprise .NET applications easier. Providing components based on proven design patterns that can be integrated into all tiers of your application architecture,Spring helps increase development productivity and improve application quality and performance..."
http://www.springframework.net

BEA AquaLogic Service Bus

http://dev2dev.bea.com/alservicebus/

Asynchronous Systems Architecture for the Web

Nice presentation
http://udidahan.weblogs.us/2008/01/07/presentation-files-asynchronous-systems-architecture-for-the-web/

patterns & practices April 2007 DVD

patterns & practices April 2007 DVD

Enterprise service bus

http://en.wikipedia.org/wiki/Enterprise_service_bus