Last year's merger of the "World Money Fair" and the "Numismata Berlin" did apparently not work out as expected. So the two are now separate events:

The World Money Fair (Berlin/DE) is the biggest coin show on earth according to the WMF website but is focused on mint presentations and numismatic colloquiums. (Of course there are quite a few dealers too ...) Other WMF shows are in Basel/CH, where the WMF was until early 2005, and in Salzburg/AT. The next dates:

World Money Fair Berlin 2007
(de) http://www.worldmoneyfair.ch/wmf/index.html
(en) http://www.worldmoneyfair.ch/wmf/english/index.html
Berlin, 02-04 February 2007
Estrel Convention Center

Basler Börse - Münzenmesse Basel 2007
(de) http://www.worldmoneyfair.ch/bmm/index.html
Basel, 20 January 2007
Congress Center Basel

The Numismata shows (there are three - one in Berlin, one in Frankfurt, one in Munich) are primarily meeting points for dealers/sellers and buyers:

Numismata Berlin 2006
(de) http://numismata.de/Deutsch/Berlin/start_berlin.htm
(en) http://numismata.de/english/Berlin/start_berlin.htm
Berlin, 07-08 October 2006
Messegelände am Funkturm, Halle 21
 
Numismata Frankfurt 2006
(de) http://numismata.de/frankfurt/fra_start.htm
(en) http://numismata.de/english/frankfurt/fra_start.htm
Frankfurt, 04-05 November 2006
Messe Frankfurt, Congress Center (CMF)

Numismata München 2007
(de) http://numismata.de/Deutsch/Muenchen/start_muenchen.htm
(en) http://numismata.de/english/start_en.htm
München (Munich), 03-04 March 2007
M,O,C Congress Center, Halle 3

Christian