for what its worth.....
Muffcuff - you can already get them, easy snippable wires
VBSS - very expencive, open to vandalism and the ratio of bikes locked to space required is uneconomic
Maxsters - very painful if malfunctions
Compo Net - Great idea, but would need a whole backpack to store a net that strong and big, could take you a while to lock and untangle
Bike Alarm - Smashable, mufflable (is that a word?), needs someone to care to stop a theif
JGB Bike Lock - you can already get them pretty much, but they are the best locks around, a simple but effective variation
Hexbolt - Steal it, drill out the bolts and replace
Steel Wheel - Unlikely to be feasible with current materials, would not fit all types of bikes, no good for wheelies
MagniLock - I'm not sure how you'd have the strength to even part magnets so powerfull, you'd be a danger to all things electrical and possibly the earths own magnetic field
The Judge - Take it off before you steal it, fun idea I'd buy one to booby trap friends bikes
1HDC - only room for 1 thick cable of decent length in seat shaft, maybe 2 thin cables which could be easly snipped
Belt Lock - Nice idea, would be quite bulky and potentially snipable but not as much as a cable would be
Intergrated Bike Lock and Pump - Nice idea, only for race handlebars and spokeless wheels???
Kickstand - Pick it up and run or steal all the other parts
The Shock Lock - Spray with insulation foam, Snip
Brake Lock - Snip brake cables, ride away, stay away from steep hills
Theft Proof Bike (seat cable) - Neat solution, snipable
Tri Cuffs - Nice idea, not really sure how cuttin the cable and THEN the cuffs lock up helps, just dont cut it and carry the bike?
The wheel cuffs are a good idea though, still needs an environment lock
K10 TD System - Awesome
Fleur de le Spike - Wear medieval armour then steal, joust your way past anyone in your way
Locbike - Definitely theft proof
Socialist Bike - I'll take mine in red
To be honest if they want to steal it they will and if those same people see a fancy bike that will disable itself by cutting a wire then they would probably do that anyway and move on to a bike they can steal, best thing to do is to buy a cheap bike and standard lock.. infact thinking about it designing the cheapest bike possible with intergrated cable lock and leaving your full suspension model at home when tootling to the shops would have been a reasonably good idea...