abstract: Event-triggered feedback systems are systems in which information is transmitted over the feedback channel on a "need-to-know" basis. In other words, feedback information is transmitted when some internal measure of the novelty inherent in that information exceeds a specified threshold. A great deal of experimental evidence suggests that event-triggered feedback can greatly reduce the rate at which information is transmitted over the feedback channel while still maintaining a high level of control system performance. This talk reviews results concerning state-dependent event-triggers used in state feedback controllers that preserve some underlying stability concept such as input-to-state stability or L2 stability. The talk presents some applications of these ideas with regard to dispatch control in power grids and control of aeronautical systems.