Just a thought I had while thinking about ISR-type setups for Linux... When you mount something to a directory, the original directory becomes inaccessible. And you can mount tmpfs or ramfs pretty much anywhere, including your home directory. Changes to tmpfs are lost when the filesystem is unmounted... Would mounting a tmpfs ramdisk over one's home directory have potential use for desktop security? Temporarily logging in with a tmpfs ramdisk so mounted seems like a good way of protecting personal data from a compromised program, or perhaps foiling a limited-user trojan when doing online financial stuff. How effective would it be for these things in theory, though?