I’ve been using a nice little add on utility called LastPass. Basically it is a utility that allows you to, securely, store all your web passwords and retrieve them from any web enabled browsers and computers including iphone and itouch devices. It also includes a secure password generator to make strong passwords for you.
There is a free and premium version available. The premium version is required for use on mobile phones and also provides multifactor authetication using any USB thumb drive you might have.