Originally Posted By: JBjorgen
Can I upgrade straight from Snow Leopard to Mountain Lion, or do I have to pay the upgrade tax twice?

You can go right from 10.6.8 to 10.8, and you only pay once at the $19 rate. License is valid for any personal Mac you own, and this includes installation into a VM running on a Mac. There is no DRM or serial key, so it's just an honor system.