We're moving into a public beta of Dublin "Windows Server AppFabric" which you can grab from HERE.

What does it mean - here's a blurb from the site.

So Velocity (distributed caching mechanism) is rolled up into this Beta (previously a MS Partner did some benchmarking on Velocity which you can find a great white paper HERE)

Previously myself and Scotty wrote a hefty technical Dublin Course which the folks at TechEd loved - we did this on some early bits of 'Dublin'. Realtime monitoring + tracking as well as recoverability were some highlights of our 3D Realtime maze process we built up in the labs.

Here's a blurb from the AppFabric server (it's a shame that SP2010 didn't use this framework for it's WF hosting...but that would have impacted delivery)

Enjoy

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Windows Server AppFabric has these core capabilities:

• For Web applications, AppFabric provides caching capabilities to provide high-speed access, scale, and high availability to application data. This feature was previously codenamed "Velocity"
• For composite applications, AppFabric makes it easier to build and manage services built using Windows Workflow Foundation and Windows Communication Foundation. This feature was previously codenamed "Dublin."