The LOw Frequency ARray, LOFAR,is a radio telescope working at the lowest frequencies accessible from Earth. Combining many thousands of simple dipole receivers (just like the one in your radio at home) with the latest in high tech computing, LOFAR will be able to survey wide areas of the sky all at once and will open up a new window for astronomers.
When completed, LOFAR will consist of over 5,000 separate antennas spread in "stations" all over Europe. The main project is based in the Netherlands, and most of the array will be there, but outposts are planned in Germany, France, Sweden, Poland and the UK. Several stations are now working, and the array was officially opened in June 2010.
Artists impression of the locations of possible LOFAR stations: