Haptic technology refers to technology which interfaces the user via the sense of touch by applying forces, vibrations and/or motions to the user. - Wikipedia
Moore's Law doesn't only apply to semiconductors, it also applies to sensors. In fact, using semiconductor process technology to create Micro-Electrical Mechanical Systems ("MEMS") is creating sensors and output mechanisms that are getting smaller and smaller.
Combine these systems with a fast microprocessor, and you have a small and efficient system to input and output information based on touch, motion and vibration. So efficient, in fact, that it can now be found in a video game controller for kids (i.e. the Wii controller).
This is just a simple application, but many researchers and industry leaders think that haptics is just starting to take off, and that we will see more and more applications and products that use it as a part of its interface.
So if you are looking for a new technology to get into, this could be one of them.