Crap! I've lost my only Kensington key and now I am stuck with my laptop attached to the desk. I've seen some videos about opening it with... toilet paper, but it didn't work for me.
Of course I can cut the link itself but I don't additional metal stuff attached forever to my notebook. Any ideas? Please help!
I've decided to post my solution from here, so it's easier to see what I have done to unlock this thing.
Opening Kensington lock PART II
Opening Kensington lock PART III