We've had a rash of bike thefts in the city lately, mostly by crack heads who trade them for a hit. I don't leave my bike out much but sometimes I'm in a store for half an hour or more. The local places usually have a cheap bike rack at best. I use a standard cable lock and a kryptonyte U lock, interlacing the tires and frame to the rack. But as I understand it this will only slow a thief down a little. What's the locking methods and combination of locks have folks developed?