OK so when I am going places, I usually try to keep my bike on me at all times. I don't usually lock the bike up, unless I absolutely have to (for fear that it might be grabbed up the second I am not there). The bike usually stays parked inside in a friend's apartment or something similar. If I am running errands, I take other means of transportation to get there just b/c I don't want to risk locking it up.
Lately over here in philly, there has been an astronomical increase in bike thefts. U locks or two U locks do not stop thefts at all. So what I am wondering is if there is ANY lock, deterrent system that is more theft proof... any comments??