Yahoo has just deleted a further 14 sites, in addition to 22 taken off-line at the end of November, and another eight removed three weeks later, said Samuel Althof, spokesman for the Swiss-based Aktion Kinder des Holocaust (Children of the Holocaust Action).
The group is spearheading a petition drive aimed at providers which host neo-Nazi sites. In less than a month, more that 3,500 people have signed via the Web site http://www.akdh.ch/, Althof said.
German neo-Nazi groups have increasingly moved their Web sites offshore, most often to the US, to evade German laws banning racist propaganda.
Asked whether he is satisfied with Yahoo's cooperation, Althof said, "That remains to be seen. We fought almost four months to establish a cooperation. It's improving step by step."
A spokeswoman at the Munich office of Yahoo's German subsidiary, Yahoo Deutschland GmbH, referred a reporter to staff at Yahoo's Santa Clara, California headquarters, who were not immediately reachable for comment.
Yahoo was fined in November by a French court over the accessibility of Nazi memorabilia, illegal in France, on its US auction Web sites. It announced last month that it would ban such items from its sites. The company has said that it will still fight the case via US courts, though it has exhausted its final appeal in France. It has denied that its policy change is in response to the French court order.