There are links all over; here is one I got from Making Light.
Want to help? Send money. Money is portable.
Update: See this Wikipedia entry.
International Committe of the Red Cross
Doctors Without Borders
Website is getting heavy usage. I quote:
Doctors Without Borders web site is experiencing very heavy traffic.
All updated activity reports on what Doctors Without Borders/Médecins Sans Frontières (MSF) is doing to help in South Asia will be posted [on their site] as they are released. If you
would like to make a donation to MSF, please use this link:
Donate securely by credit card or donate by phone at 1-888-392-0392.
Click here for info about volunteering with MSF
Emergency: Earthquake in South Asia
December 27, 2004
In response to the earthquake and tsunamis that have devastated parts of South Asia over the past weekend, Doctors Without Borders/Medecins Sans Frontieres (MSF) is preparing to provide emergency assistance to people affected by the disaster. MSF is readying a full charter of relief supplies for the area of Indonesia closest to the epicentre of the earthquake.
In addition, MSF medical teams are on the ground in Sri Lanka, Thailand, India, Malaysia, Bangladesh, and Myanmar assessing emergency needs and offering assistance. MSF fieldteams in all countries where MSF is present, including Somalia and Kenya, are also investigating damage from the disaster.
Prime Ministers National Relief Fund (India)
Send checks to:
Prime Minister's National Relief Fund
Embassy of India
Attn: Head of Chancery
2107 Massachusetts Avenue, NW
Washington, DC 20008