Here are some resource links for news and details on how to help. Given the dimensions of the catastrophe, cash donations to reputable relief agencies are most urgently needed. For updates and contacts for aid groups, see:
The U.S. State Department Operations Center said people seeking information about family members in Haiti should call 1-888-407-4747. Due to heavy volume, some callers may receive a recording.
US State Dept. blog
Haiti Earthquake Response page
Haiti: How to help
NPCA Haiti Disaster Response page
Discussion & networking group on Connected Peace Corps