www.amnesty.org  - Amnesty International, an organization devoted to international peacekeeping efforts. You can sign easy petitions to aid in their cause.

From the Amnesty website:

Amnesty International (AI) is a worldwide movement of people who campaign for internationally recognized human rights.

AI’s vision is of a world in which every person enjoys all of the human rights enshrined in the Universal Declaration of Human Rights and other international human rights standards.

In pursuit of this vision, AI’s mission is to undertake research and action focused on preventing and ending grave abuses of the rights to physical and mental integrity, freedom of conscience and expression, and freedom from discrimination, within the context of its work to promote all human rights.

Help stop torture at Guantanamo Bay