Dried soapberries apparently work better than soap! Just throw about five berries into the provided wash bag, and boom, laundry that's fresh and clean. And those berries are good for TEN loads.
Promising Review: "It really gives the laundry a 'fresh' smell, a REAL fresh smell, not that crappy perfumey smell! (If I want to smell like something, I'll choose something that doesn't smell like my linens, my husband, my kids, etc!)" —Mur