Doug Schaefer at QNX has an interesting post on Qemu
"... an open source processor emulator that can emulate a number of different processors and peripheral devices, to run a Debian Linux ARM installation."
Qemu can sometimes run faster than the ARM it is emulating! Not magic at all when you think about it a bit, but cool for sure.
More typically my goals are the opposite: I like VMwar's ability to run a configured os + software unchanged. Slow is just fine. Even if scaling after development making development smooth and hiccup free is wonderful. Really it is a requirement. Coding by convention (ala Ruby on Rails (RoR)) solves many problems. But its not appropriate for all contexts and when it is not, VMware is one approach that may help.
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