If you haven't heard about the earthquake in Haiti, maybe you're living under a rock. The pictures and video coming out of the country are showing unimaginable tragedy. See here, here and here.
If you want to help, one way to donate $10 that would be charged to your cell phone bill is to text "HAITI" to 90999.
You also can give to The American Red Cross and/or check this link to the White House blog, which has other resources.