More on the nested liner...
Sal explained it particularly well (surprise!) at the NYC show. Let me try to paraphrase:
When you see other liner locks with those big, heavy, double liners, they give the impression of great strength, mostly due to their heft. Those liners are held in place, in most(every one I've seen)cases, by tiny pins. When closing force is applied to the blades of those knives, it is concentrated on those pins. The heavy steel, etc. becomes a moot issue, because as the closing force tries to rotate the lock out of the scale, the failure point of the lock is being determined by the failure point of those tiny pins. If they go, the lock goes.
With the nested liner, as the name implies, the lock is actually nested into the G-10 of the scale. Ergo, when closing force is applied to the lock, and it wants to rotate out of the scale, all the force is transferred to the scale itself. For this liner to fail (under closing pressure) the lock would have to burst through the side of the G-10. It's a matter of how the forces are dissipated. A suspension bridge can have a longer span than a conventional rigid one, an arch can support more than corbelling, etc.
It's a very elegant solution, and more high-tech, expensive and labor intensive than just pinning a couple of liners into the scales. I love explaining that to people who tell me that Spyderco underengineered the Military, by only giving it one liner. Now you can too.