found some new ways to stop people from taken your car...
http://www.brakelock.com/
http://gmcmotorhomeinfo.com/BRKLOCK.html
havn't found much info on the brakelock, but the mico parking lock is used a bit on big rigs and trucks. BTW the mico thing runs about 300 bucks and the brakelock is $125.
what do you think?