Take the camera apart as much as possible, open all connection covers and batery door, etc., if possible, extend the lense and pull the battery out with it extended. If the camera has a seperate clock/settings battery, remove it too. Then put it in an airtight container of instant rice and store at room temperature or warmer for a few days at least, the longer it's in there the better chance it has of working. works well for many other electronics too.
Robbie Foxxie, August 2010