More than anyone else Ronald Reagan should be given credit for the wall coming down. In 1987 he gave one of the most inspiring speeches of any US President at the Brandenburg gate in West Berlin:
General Secretary Gorbachev, if you seek peace, if you seek prosperity for the Soviet Union and Eastern Europe, if you seek liberalization: Come here to this gate! Mr. Gorbachev, open this gate! Mr. Gorbachev, tear down this wall!
Germany's "Der Spiegel" has a interesting slideshow of The Wall Then and Now.