The big draw of Xen is not in easing or refining development, it's in enhancing security. In a way it's like an extreme verison of a hyper-visor.
In other words, each individual server runs in it's own little virtual box, and cannot damage the integrity of the rest of the system, through either fault or attack. This is why RedHat and Solaris are so into virtualisation right now, it's the next big thing in securing servers.
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