Your camera may have this feature. It will automatically read a zone of your image on which to auto-focus, so your subject does not need to be in the center of the frame.
The latest technology in rechargeable batteries for electronic devices. An advantage of the NiMH is that there is no memory effect, which often occurs with Nicads if they haven't been fully discharged before being charged.
This is a hardware solution to counteract an unsteady camera. It is typically preferred to Digital IS because Optical IS results in higher-quality pictures.