I really like the idea of using a bike chain to secure the saddle. I have to replace the chain on my commuter, and now I know what to do with the old chain. I've been using the On Gaurd Akita seat leash ever since my saddle got stolen and that has seemed to work pretty well. However the bike chain has the added benefit of being reasonably stylish.

I still want to create some sort of attachment for my saddle like the handle of the sword in Blade. Don't hit the switch in the prescribed amount of time and things shoot out that take off your bits.