The Mondragón Cooperative Corporation is the first major big corporation that works on workers self management. The MONDRAGON Corporation, is a business group made of 264 companies and entities organized in three sectoral areas: Financial, Industrial and Distribution, together with the Research and Training sectors. It is one of the world's largest worker cooperatives and one important example of workers' self-management. heres more data on it :
http://en.wikipedia.org/wiki/Mondrag%C3%B3n_Cooperative_Corporation
http://www.mcc.es/ing/index.asp ( their official website )