I've been having some mouse troubles lately (I can't find a mousing surface that my mouse gets along with), and it's occurred to me that I get along just fine and dandy with my trackpad on my laptop.
What I really need, I think, is a trackpad for my desktop. What if Apple shipped a multitouch trackpad that you could plugin into the right of your nice aluminum Apple keyboard ? One that matched the form factor, and just plugged into that suspiciously convenient USB port on the right or left side !
A Bluetooth version could be made available for people with the bluetooth keyboard.
The only possible problem I can see with this idea is that it's already a looong way over to the right of my keyboard, although really that's where my mouse lives at the moment so I suppose it's no further away that that.