I'm sure there will be many of these published today. Send me more if you run across any and I'll add them to the list.
Photos by Peter Turnley taken in Romania, Berlin, Czechoslovakia, Soviet Union, and Hungary, most of them in late 1989.
Update: Pictures from a Vanished Country by Magnum's Thomas Hoepker.
Earlier this year I realized we would celebrate the 20th anniversary of the fall of the Berlin Wall. I went back into my archive and discovered that I had boxes full of negatives that I had never seen before, taken in East Germany over the past 50 years. It was a treasure which had to be unearthed.
(thx, bojan)
Update: The Berlin Wall: Rise and Fall, photos from Life magazine.
Mediabistro has collected video of how the news was reported on American television.
Update: The Big Picture weighs in: The Berlin Wall, 20 years gone.
The NY Times asked their readers to submit photos of the Wall: The View From the Wall.
The Times also has some nice split-screen photos of before and after the Wall fell. (thx, mau)
Photos from Poland in the 1980s. (thx, tomek)
From the WSJ: Wall's Rise and Fall. (thx, paul)