Victor's Mac 101 yesterday gave you the basics of the Keychain, so we all know what it's good for -- keeping your passwords and credentials in a convenient, automatic and protected file. Still, that's an awful lot of passwordy goodness to keep in one place, especially if some of those passwords are controlling access to your financial or professional information.
Y'know, what would be really cool -- if you could do it -- take that keychain, and put it on a portable drive, and then you'd have physical control of your passwords even when you aren't with your computer... nice.
Conveniently enough, there's a great walkthrough at nevali.net to accomplish this exact task. The basic steps: make a new keychain (with a secure, complex password) and save it to your removable media; once that's done, set your default keychain (where Mac OS X will put new password saves automatically) to the new, portable keychain. From that point on, you can take your passwords with you -- just don't forget to back up that USB drive somewhere safe.