The Diceware Passphrase generator is a Perl CGI implementation of the Diceware password generation scheme. Basically, the software simulates the roll of five dice multiple times. Each roll determines one word of the passphrase.
mimic icky affair hy loud bauble corbel
By default, the generator will create a seven-letter passphrase, which is sufficient for all but the most paranoid of purposes. And if you're that paranoid, what are you doing using a passphrase generator created by someone you don't know running in an uncontrolled fashion on a webserver you don't have control over? Download the GPL-licensed tarball, install it yourself, and then you won't have to worry about what evil things I might have done.
Diceware 1.0