I don't try to protect my fork. If someone has the time to disassemble my bike to that extent, they are going to get something. My fork is not that valuable. I do generally run a cable lock through the front wheel and the frame. I figure the front wheel is the easiest to pop off. Of course, they could fairly easily pop off the back wheel - I dont have enough cable to do both.

There is no such thing as a locking method to theft-proof a bike.