Originally Posted by slaWter
The first iPhone's killer feature was it's Touch interface. Tablets, Smart Phones, PDAs and so on existed before for a long time. But that all-appealing super-gadget wasn't on the market yet. And Apple brought it first. Since then, pretty much all Smart Phones transitioned from an Stylus or Keyboard interface to the iPhone's Touch interface.
You're referring to capacitive touch screens (which don't work with a fine point stylus and support multi-touch) and no, apple wasn't the first here. Many windows phones and blackberries had this before apple.