Windows Server AppFabric is a set of integrated technologies that make it easier to build, scale, and manage WCF and WF applications running inside of IIS. AppFabric is the brand name for the hosting and caching features previously called Dublin and Velocity.
A beta release of Windows Server AppFabric is available for use with .Net 4.
I gave one of the talks on Windows Server AppFabric, covering the extensibility in terms of hosting web service applications and integrating with workflow services. My slides aren't showing up on the PDC web site so you can get them from the attachment to this post. Mark Fussell and Murali Krishnaprasad also talked about AppFabric, covering how to use the hosting and caching features, respectively.
.NET 4 and Windows Server AppFabric provide new application hosting, tracking, and persistence capabilities. Learn the benefits of different hosting options and how to choose the right option for your scenario. Learn about custom tracking providers and how the built-in tracking system can be extended to meet your custom business data monitoring requirements. Learn about the new subsystem for managing durable application state using Microsoft SQL Server or custom application-specific stores.
Workflow Services and Windows Server AppFabric by Mark Fussell
Learn how to use Windows Workflow Foundation (WF) 4, Windows Communication Foundation (WCF) 4, and Windows Server AppFabric (formerly code name "Dublin") to build and manage scalable, reliable, and highly-available applications. Discover the power of WF to build and coordinate WCF services and implement logic on the middle tier. Enable sophisticated messaging patterns with correlation, enhanced transaction support, durable services, and config-based activation. Learn how AppFabric makes it easier to deploy, manage, and monitor WCF and WF applications.
Scaling Your Data Tier with Windows Server AppFabric by Murali Krishnaprasad
The distributed in-memory caching capabilities of Windows Server AppFabric (formerly code name "Velocity") will change how you think about scaling your Microsoft .NET-connected applications. Come learn how the distributed nature of the "Velocity" cache allows large amounts of data to be stored in-memory for extremely fast access, how AppFabric's integration with Microsoft ASP.NET makes it easy to add low-latency data caching across the Web farm, and discover the unique high availability features of AppFabric which will bring new degrees of scale to your data tier.