[COLUG] Encrypted Filesystems

[Scott Merrill]

> And second I would like to encrypt a usb memory stick so that I can
> access the file system from linux, windows and osx. It would be nice
> if this could be done with userland tools so that every system I need
> to access the usb memory stick from does not need to have stuff loaded
> as an admin user.

Take a look at TrueCrypt:
     http://www.truecrypt.org/

It doesn't currently have a Mac client, so that might rule it out for you.