Which charities worldwide are collecting donations for the victims of the earthquake in Haiti on January 12 2010?

Most international aid organizations are collecting donations. The Red Cross and Doctors without Borders are among the best known and biggest organizations.

If giving money to charity, be careful, and check them out. Many fake charities are se up to steal money, especially at times of disaster like this. You can go to sites like Charity Navigator to look them up and see if they are reputable and make good use of their money.