Microsoft have made EBS RC1 available via Public Preview. It can be downloaded from here.
Other useful links from the TechNet site:
Very handy documents (in .doc, .pdf or .xps format) to download and READ (as Susan says) before any migrations:
Two very useful resources to keep an eye on while evaluating and testing EBS:
And finally, if you need some gear to run this on, check out:
HP BladeSystem – in particular, the c3000 enclosure (“Shorty”)
IBM BladeCenter – in particular, the BladeCenter S offering