I've thought about this in my idle time for many years and I think I'm right, because who the heck wants to move more than they absolutely must to do something on a computer? Loonies, that's who! No amount of hand-waving or finger-swiping b.s. will ever displace the mighty computer mouse. The ONLY thing that might be easier is direct brain (or maybe, maybe eye) input. Don't think I didn't think of trackball devices; I'd lump them in the same category as a mouse. I just like to check these ideas against the mob to see if I'm anywhere near reality. Let me know your opinions, mobsters! And hey, just in case this idea is totally original, when 3D monitors become standard then they could just add a slider to the side of the mouse that your thumb can move forward and backward, for zoom in/out in 3D GUIs (or whatever -- it could be assignable). I THOUGHT OF THIS FIRST (I hope). Now that I think about it more, I guess it could also be another wheel like the scroll wheel, just on the side. Anyhow that will save you from having to dual-purpose the scroll wheel or the other buttons. It might be useful, after all, to scroll AND zoom at the same time, under the right conditions.