Hmm, I've used excellent touchpads (including Macs), but don't like them compared to mice. I prefer them to c**p touhpads of course, but I find my fingertips get irritated by using any touchpad for more than a few minutes.

I like the multi-touch trackpad on the MacBook range, but I still plug a mouse in, when using the 13" MBP at a desk.

Like Sas said, it needs pressure sensitivity in order to replace a traditional tablet - one thing that will also hold the iPad style devices back from doing "professional" work, in their current configuration.

The Magic Mouse makes a better compromise, I think. That said, I'll be sticking with my MS Intellimouse Explorer 3 for now...

I still have a USB mouse plugged in to my iMac even though it comes with a Magic Mouse. Mice are so very useful and even touch screens may not eliminate their use.