I'd say for the most part nearly all of the technology Kurzweil predicts ends up being available, it is just the implementation of this technology that muddles the prediction.<p>In Kurzweil's talks he often expounds on the high predictability of technological progress (price and power of computing, etc).  He does not so much cover how humans will use this tech.<p>Im sure that iPod Nano's (or equivalent) could easily have been embedded or sewn into clothing or hats for years now.  Speech-to-text is available now and I use it in Google Voice all the time.  It's a matter of choice in this case, not the technology.