Niels Provos writes in that he has added Mac OS X support for Systrace, a sandboxing/application confinement tool that can be used to increase application and service security. It installs a new kernel to support /dev/systrace and the Systrace application, and a Cocoa frontend.
Never try to teach a pig to sing. It wastes your time and annoys the pig.
-- Lazarus Long, "Time Enough for Love"