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swa66 - 11:14 pm on Nov 17, 2009 (gmt 0)
I'd not use "steal" on the trivial parts. On the major leaps: yes that's more like "stealing" if you "copy" it without permission, as it should be patentable to the one inventing it.
There are trivial steps in interface evolution (e.g. after you find the concept of a back button: adding a forward button.)
There are also huge leaps ahead in interface design: e.g the mouse.