The Kwikset Smart Key series sells itself as being bump proof and re-keyable. I am not sure if that just means with the keys they sell or any key you have that fits. This series of locks features a side-locking bar system that is used instead of a pin and tumbler system. The side-locking bar system is what makes the lock bump proof. The Kwikset website claims that the locks are pick resistant, but still not pick proof. The other selling point is that you can re-key the locks yourself. To do this you must have the currently used key, the re-key tool they give you, and a new key you are changing the lock with. The annoying part is that the slot for the re-key tool is on the outside of the lock, which may be a potential security risk. As well as it just getting clogged or messed up from being on the outside of your house and exposed to the elements. Unfortunately, if you lose your key, you still have to get a locksmith to reset the lock. Or you have to buy the reset tool and dismantle the lock yourself, to reset the lock cylinder. So all in all, this series looks like a step in the right direction for home security. Watching all of those lock bumping video on youtube should make you want a lockset like this.
Here is one of the commercials