MoFo's security tip:

When I know my car will be sitting for a good amount of time, I pull the main ECU fuse. I have a little plastic box to put it in so it doesn't get crushed.

This way they can't start it at all, if they REALLY want it they can just roll it onto a flatbed or pop in the fuse, but chances of that are pretty low.

But sorry many I feel for you. My buddies fixed up gen2 integ (b16 swap, blah, blah) got nabbed a month ago right in front of his own house.