@ Randya: I totally second the sentiments expressed by Jasong. Furthermore Paranoia and Realism are not at all the same thing. Having had at least 4 or 5 bikes stolen in NL (and my friends probably about 40 all told) made me savvy,.. this -for me at least- is not an imagined problem. I think it isn't paranoia but wisdom for anyone in a theft prone area to give this thought. Additionally i personally am not worried about theft because of the counter measures i take. I am aware, not worried.

@ Jasong: I do think like a thief ha ha. That's because my hobby (squatting) of many years involves rapid breaking and entering, risk assesment and the weighing of the -is it worth it- equation. I have also opened many bike locks with different methods (for their owners when they had lost keys for example). However, I never ever steal bikes though. But i have read extensively on the subject and spoken to many professional bike thieves as i find it interesting.

The thieves themselves recommended most of the measures (as well as the locks) i employ (see also this thread: http://www.bikeforums.net/showthread.php?t=148867 as the best chance of defeating them. Nothing is fool proof but i do my utmost to get as close to it as possible and consider myself very fortunate that i chose to own a E 370 Folder that looks like it is worth E 50 and rides like comparable machines worth E 600 or more.