I call VMware a flirtation because it will run on an otherwise ordinary system (provided that I have enough kernel source around to compile its modules). Installing and using VMware is thus a reasonably casual thing, something I can do without particularly perturbing the system. I can even normally boot my system with VMware's kernel modules loaded, and only contaminate things if I actually need it this time around. Xen's hypervisor approach requires a much bigger change in my system; I can't add Xen to a running system, I have to boot the Xen environment from the start. Which requires a special Xen-enabled kernel, which requires special patches that you have to integrate into your kernel, which gives me nervous flashbacks. Being able to run stock kernels is valuable for me, and with Xen I give that up, so setting things up for Xen means a fairly significant commitment. I can understand from a developer's point of view. We flirt with everything that is there. But somewh...
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