  Radio detection of extensive air showers initiated in the Earth's atmosphere
has made tremendous progress in the last decade. Today, radio detection is
routinely used in several cosmic-ray observatories. The physics of the radio
emission in air showers is well-understood, and analysis techniques have been
developed to determine the arrival direction, the energy and an estimate for
the mass of the primary particle from the radio measurements. The achieved
resolutions are competitive with those of more traditional techniques. In this
article, I shortly review the most important achievements and discuss the
potential for future applications.
