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The free version of PasswordSafe is fine for use on a PC or laptop. If you're using a disk-on-key to store you passwords for use on multiple machines, however, you might be interested in the following versions of PasswordSafe:

PasswordSafe2Go - Keep your password database on a disk-on-key along with PasswordSafe. No need to install PasswordSafe on any of your PCs. Just plug in your Disk-on-Key and double-click on the PasswordSafe icon to securely access your passwords.
PasswordSafe for U3 - A version of PasswordSafe that runs under the U3 framework. Just plug in your Disk-on-Key, and double click on the PasswordSafe icon in U3's launchpad to securely access your passwords.

All purchases include free upgrades for one year from date of purchase.