From the Red Cross:

If you want to help those affected by the Haitian earthquake, the simplest way is to make a donation to the American Red Cross International Response Fund. We are also receiving money through a third party mobile fundraising effort sponsored by Mobile Accord. Mobile donors can text “Haiti” to 90999 to send a $10 donation to the Red Cross. The funds will go to support the Red Cross relief efforts in Haiti.

You can help the victims of countless crises, like the recent earthquake in Haiti, around the world each year by making a financial gift to the American Red Cross International Response Fund, which will provide immediate relief and long-term support through supplies, technical assistance and other support to help those in need. The American Red Cross honors donor intent. If you wish to designate your donation to a specific disaster, please do so at the time of your donation by mailing your donation with the designation to the American Red Cross, P.O. Box 37243, Washington, D.C. 20013 or to your local American Red Cross chapter. Donations to the International Response Fund can be made by phone at 1-800-REDCROSS or 1-800-257-7575 (Spanish) or online at www.redcross.org.