I work for a non-profit in an area with a high population of Haitians. This morning (well yesterday now) I went to a Haitian Task Force town meeting where the task force was trying to work out a plan to get donations to Haiti. Several of the people leading the meeting were in touch with various agencies within Haiti.
To echo what many people are saying here, the agencies and orgs in Haiti that were directly in contact with the folks present at the meeting said
do not send supplies. Relief workers literally have to carry things into the more devastated areas.
It's money that is most needed to send people there for clean-up, medical aid and food/water drops. Also, I heard that there are some health organizations that have partnerned with airlines to fly nurses and doctors there for free.
ETA:
http://urbanlegends.about.com/b/2010...r-facebook.htm So, that last part was probably part of the hoax that local people have bought into. How horrible!