Here you can find a list of companies that are sponsoring the Olympic Games in Beijing. The post itself is in Swedish, but (1) Swedish is not very difficult to read and (2) you can still parse the list of companies at the very top.
The management of these companies have no reasons to care about the fate of the people of Tibet. But since they are all greedy fuckers they will care if they start to lose sales. So hit them where it hurts. Boycott them all!