The sheldon locking method (u-lock through the rear wheel inside the rear triangle) works very well.
Earlier tonight I found my chain dropped and my rear wheel unbolted from the track ends. Apparently someone made an attempt to take the frame but failed to separate it from the rear wheel thanks to the u-lock. The only thing that sucks is that the rear rim has a few small scuffs and markings from the guy trying to force / tinker the lock off, but it's just cosmetic.
Granted, if he REALLY wanted the bike he would've found some way to get it. But it seems that proper locking at least helped to demotivate him from continuing to try.
I also had a second u-lock through the front wheel AND a cable through the saddle, securing both to the frame, so there was no loss at all.
I'm still pissed off about the scuffs on the rear rim though.
****ER!
Last edited by NateRod; 10-13-10 at 12:31 AM.