It happens to all berry fans. You pick a bunch of berries, or buy some in the store, and within a day or two you have mold growing on them. Yuck.
Earlier this week, the New York Times ran an article (free registration required to open link) about how to solve this problem. Give the berries a warm to hot bath of about 125 to 140 degrees (depending on the thickness of the berries skin). This process is called “thermotherapy,” and it seems to do the trick.