When thou doest alms, let not thy left hand know what thy right hand doeth -
but since this admonition seems to be hard to follow perhaps the best way to give for the stricken people of Haiti is with a microcredit organisation.
The Lambi Fund is named after a shell that is used as a horn to call a village meeting (for example).
You can find it here.
Supporting people directly is a good way to circumvent the ongoing US occupation of the country (the third time within a hundred years).