Mercy Corps workers are still on the ground in force in Haiti - one year after the devastating earthquake. John Oldham is lead on the Haiti Relief Project for the Portland-based international aid organization. Right now, Mercy Corps is proving water purification pills and educating the population about cholera, which is treatable but can be deadly if not treated quickly.   They are also operating cash-for-work programs and providing mobile phones that act as vouchers for food and supplies.