As with screws, a little paraffin or beeswax will make driving certain nails, especially casing nails, much easier. If you are driving a cement-coated nail, always keep it going all the way once you start. Friction heats up the nail's coating and if you stop midway it cools down and tries to glue the nail in place.
Computer screen savers may be entertaining, but they consume energy. An Energy Star labeled monitor with its “sleep” features enabled uses half the electricity of a standard monitor.