I had a few smart watches over a decade ago (http://en.wikipedia.org/wiki/Fossil_Wrist_PDA for example) and there have been others.
Your ideas have been kicked around for years and with a new wave of low power electronics and better batteries it may happen. However patents and such can be a problem.
I am interested in your thoughts about wearable tech and music. I think wearable tech has a lot of potential to change the way we listen to music.
For example, what do you think about the idea of using smartwatches to measure heart rate and movement and other vital information, in order to automatically select the appropriate music? E.g. if you're working out, a recommendation engine in your smartwatch could automatically play music to get you pumped etc.
Would you use such a recommendation service? What do you think about it?
Do you have any other ideas how wearable tech could create new music experiences?