I am really impressed by the power of a MoveOn campaign. It was launched 4 hours ago, and already has 200 Toyota owners, in front of their Toyota's protesting that company's participation in the US Chamber of Commerce (which has been lobbying against passage of a climate change bill in Congress).
This campaign, using Flickr, and MoveOn designed signs, printed out and customized "locally," really demonstrates the power of consumer's wallets on the marketplace. It is just so much more convincing and direct that everyone agreeing to boycott tuna.
We'll have to wait and see if this actually pressures Toyota to leave the US Chamber. But an inspiring campaign.