FreeBSD Jails
BSD Forums writes "A common security breach involves exploiting one application to gain access to another. Keeping separate applications separate can limit the potential damage. OnLamp's Mike DeGraw-Bertsch explains how FreeBSD's jails can help secure necessary applications."
Does Linux offer something similar [to chroot jails]?
Linux has a chroot jail.
SCO has the other kind of jail too, unless you pay $699 to Darl McBribe [sic].
Will I retire or break 10K?
Allow script kiddies to root your box.