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WSPR (pronounced like "whisper") stands for Weak Signal Propagation Reporter. WSPR is a ham radio operating mode used to map radio propagation paths throughout the world.  At any moment, you can see where in the world one location can reach another on each high frequency (HF) band.  Check out the  live map of WSPR station connections. The map is created real-time and any ham can contribute. Download the WSPR software and use it to control your HF station (just like PSK31 or most of the other digital modes).  Warning, run you radio at 1W or less!  That's right, WSPR is designed for ultra low power.  Stations with 100 mW (yes, 100 milliwatts, or 0.1W) share signal reports across oceans because WSPR is a special protocol for weak signal reporting. If you connect your station to the Internet, you can contribute to the live world-wide map.  It is incredibly fun set up your station for 50 or 100 mW and see your signal reports from other countries.  Weak signal operation is cheap, easy and exciting.

WISPR software by K1JT

LX3KR wrote an interesting article on how to build a WSPR decoder with a headless Raspberry Pi: http://lx3kr.blogspot.com/
Raspberry Pi
G4ILO wrote an interesting article that provides additional insight on this fascinating mode: http://www.g4ilo.com/wspr.html.
WSPR and SDR setup (source: la6tpa)