The borders between the Dominican Republic and Haiti are closed at the moment as the roads and bridges are unusable around Port-au-Prince. They are waiting for the military to repair them. The only traffic crossing at present is official aid convoys and the transport bringing the injured to our hospitals which have all been thrown open to them, including the military hospitals.
UNICEF has opened a donation page
Donate online to UNICEF's Haiti Earthquake Children's Appeal, and the Red Cross has a link where people can register to inform relatives that they are safe
Haiti earthquake 2010. Of course this will probably not be of use for a while until they restore power and get organised there.
Quite a few aid planes are landing at our airports, waiting for their slot to fly into Port-au-Prince. Strangely the duty-free area at our local airport - Puerto Plata - has just burnt to the ground this morning! Must be all that rum! lol!