Lets say that I am an electrical engineer (which I am) and was somewhat interested in developing some product that would directly compete with the ipod market (which I also am). I am looking at what kind of things that you as the consumers would want in such a device?
Right now I have a few things myself that are extremely important such as:
the ability to drive headphones properly
High quality audio chip
10+ hour battery life
But the most important aspect to me is the UI. The problem with the highest quality portable audio players is that they may have amazing sound, but the user interface completely sucks. This has got to the point where people return the product because its too difficult to deal with.
With that said, what would be your dream device with no regard to what it would cost to make? What kind of features would you want in it?