CHANGE YOUR PHONE SERVICE.

Thanks to MEB, fellow UTS student, for flagging Working Assets for attention. Working Assets allows you to support effective nonprofit groups with every phone call (local, long-distance, and cellular) you make. Because I think the group is so cool, permit me an extended excerpt from their About page:

MISSION
Working Assets was established in 1985 to help busy people make a difference in the world through everyday activities like talking on the phone. Every time customers use one of Working Assets' donation-linked services (Long Distance, Wireless, Credit Card or Online), the company donates a portion of the customer's bill to nonprofit groups working to build a world that is more just, humane, and environmentally sustainable. To date, $40 million has been raised for progressive causes. [...]

DONATIONS
Since 1985, Working Assets has generated $40 million for progressive nonprofits, including Greenpeace, Oxfam America, Rainforest Action Network, Human Rights Watch, Planned Parenthood, Stand for Children and Doctors Without Borders, among many others.
   Each year Working Assets supports nonprofit groups in five categories: Economic & Social Justice, Environment, Civil Rights, Peace & International Freedom and Education & Freedom of Expression. In 2003 alone, Working Assets raised over $3 million in donations for 50 groups such as ACLU, Human Rights Watch, Earth Island Institute, People for the American Way, and Center for Economic Justice.
   Every year, a percentage of Working Assets' revenue is placed in a donations pool for annual distribution. Donations come from the top line (sales), not bottom-line (profits), therefore donations are made whether or not Working Assets makes a profit.
   Customers can nominate nonprofit groups to receive funding each year. After an independent foundation evaluates the effectiveness of the hundreds of nominees, Working Assets employees and board of directors select 50 groups for the annual donations ballot. At the end of the year, customers vote on how to distribute the donations among the groups.
   Customers can voluntarily "round up" their monthly long distance bills, donating the tax-deductible extra amount to Working Assets' general funding program. Working Assets also makes special appeals for round-ups, addressing immediate needs like emergency relief efforts. [...]

You can see information on Working Assets' long-distance or wireless services. (I should pass on a caution against signing up for the credit card, however.) Consider the change whenever your plan runs out.