What upcoming technological development interests you the most?
nostrademons: E-ink.  Sunlight-readable displays that consume no power could open up a whole bunch of new markets.  The Kindle is just the beginning - could you imagine replacing road signs with E-ink?  They could change to reflect traffic conditions, automatically routing traffic around jams without requiring that drivers glance down at their cell phones.  If only they were available in color...If someone ever invents a worthwhile holographic display, that would be huge as well.  The limiting factors on most portable electronic devices are the display and keyboard: if you could have a full-sized, immersive 3D display and an accelerometer-based pointer, you could do so much more with your phone.