Design site Core77 regularly runs "One Hour Design Challenge" competitions; I would love to see how many of these ideas were thought up and drawn in an hour. The winner in their latest, to design a better bike lock, is very clever. I use a heavy chain that weighs more than my bike and don't think that cable would stop a dedicated thief, but perhaps there are still parts of the world where this would work, or some new superstrength cable that would foil the boltcutter.
Componet is an idea that was very successfully applied to backpacks with the pacsafe; looks like it might be a bit time-consuming.
Here they integrate the lock into the front wheel. See them all at ::Core77