Come up w/ your own ideas, Apple, and stop stealing others. lol
http://www.hp.com/united-states/campaigns/touchsmart/
Just keeping the "Praise Apple" fanboys here humble. I wonder how they'd feel if HP sued Apple over this? Oh, wait... I know!
Now getting serious: Won't work. People are use to having their iMacs a good foot away from them at the far back end of the desk. Imagine how tired your arms would get having to stretch. Imagine how tired your eyes would get to have your iMac a few inches away from your face... besides awkward looking.
The TouchSmart doesn't work. It's inaccurate and has the computer crippling Windows OS.
Also: Everyone should stop assuming it will be touch only. You know it will have a keyboard, mouse, and touchscreen which would BE AWESOME for graphics design and manipulating of a lot of information. There are times I wish I could do things with my hands on my current iMac, much in the way I've been doing things on my iPhone.