Back when Leopard debuted, and everyone was wondering what on earth stacks were for, I suggested that the big icons looked perfect for pressing with a finger. Since then, the touch-friendliness of OS X has only increased. The large, finger-friendly interface of stacks has been augmented with scrolling (using an unobtrusive scrollbar reminiscent of iOS), navigable folders and back buttons (also in the style of iOS). Quicktime X has also appeared, with very iOS-like large, finger-friendly controls. And in adding new capability to the Dock (such as exposé), Apple has resisted the temptation to employ the right click - the clicking-and-holding method still allows for finger control. In addition, we now have inertial scrolling built into the OS. There has been a lot of talk about an extra "iOS Mode" appearing in OS X, but I don't think they need a separate mode. In the Dock, they have an entirely finger-friendly springboard, and it would not take much for them to adapt the iLife and iWork apps to work well with touch. This way, the basic, every-day uses of the machine would be finger-friendly for most people, and if someone wanted to do something more sophisticated or use an app that was not designed for fingers, they could just pick up a mouse. I don't know if they will add touch capabilities in 10.7 (or ever), but I think it's pretty clear that their design decisions over the last few years (and maybe back to the design of the dock itself) have always kept in mind the possibility that one day they might want to make the OS touch friendly.