UPDATE: Now available at Amazon
The Garmin chirp was announced this morning — a wireless geocaching beacon designed for multi-stage caches, although it seems to cry out for other uses as well.
Slightly larger than a quarter and weighing in at 1 ounce, the chirp has a one-year battery life and a range of 32 feet. It can transmit hints or coordinates for the next stage of a cache
Wireless-enabled Garmin Dakota, Oregon and GPSMAP 62/78 series units are listed as compatible. The chirp is password protected and provides the owner with stats showing the number of visitors the chirp has recorded.
