Please research these companies yourself to decide whether you want to boycott them or not. There are now a multitude of resources available to investigate companies that you regularly shop with:

Ethical Corporation: Excellent resource with articles, analyses of corporations as well as up to date news.

Ethical Junction : Fantastic resource providing information on positively screened companies and organisations and links you through to ethical and sustainable products and services provided by our members.

Ethical Company Organisation: The Ethical Company Organisation compares the ethical and Corporate Social Responsibility records of thousands of companies and brands - and provides these to ethical shoppers, NGOs, ethical businesses and government.

Ethical Consumer: "Ethical Consumer magazine publishes buyer's guides designed to help you find the products which best fit with your own values. "

Ethiscore: Search by company or industry to discover what companies are up to (free reports available)

A Guide to Ethical Living:  Guardian insight into ethical living in the industrial age

EXAMPLE
COMPANY FOCUS: EXXONMOBIL

Exxonmobil
As the world's largest private oil company, ExxonMobil has the power to direct the energy industry and policy makers toward a smarter, cleaner, and more secure energy future. The solutions to reducing our dependence on oil while strengthening our economy, creating jobs, and protecting the earth are available today. Instead, ExxonMobil is using its profits and power to take the world backwards and keep us addicted to oil.

ExxonMobil is the only major oil company:

• Funding front groups that confuse the science on global warming and delay action;

• Refusing to invest in clean, renewable energy that doesn't pollute our air and water and will bring down consumer costs of energy;

• Denying the urgency of global warming and lobbying against action;

• Still a member of Arctic Power, the single-issue lobby group trying to open the Arctic National Wildlife Refuge.

Plus:

ExxonMobil has still not paid the $4.5 billion in punitive damages it owes for the 1989 Exxon Valdez Oil Spill! So far, 6,000 fisherman and others harmed by the devastating spill have died awaiting compensation.

Corporate Watch - ExxonMobil
Stop ExxonMobil
Expose ExxonMobil