My friend and colleague Joe Fitzgerald says...
"Rabbit will now properly scale on Windows now that Erlang runs 64-bit on Windows. You could only address ~1.2 GB prior to this release, meaning that the Rabbit high-water mark (after which it would start flushing to disk) was somewhere in the range of 450MB.
With this announcement – and the IronFoundry stuff – I think the pieces are finally starting to come together for scalable cross-platform apps."
The plan is to release something on IronFoundry soon...
http://www.ironfoundry.org
http://seroter.wordpress.com/2011/12/13/first-look-deploying-net-web-apps-to-cloud-foundry-via-iron-foundry