Managing online passwords across different computers, browsers and operating systems can be very tricky, the developers at LastPass Corportation seems to have heard our prayers and developed LastPass - a free cross-browser, multi-platform secure password manager, currently in BETA the service is simply amazing, far better then any free password manager out there.
Lastpass is pretty easy to install and provides plugins for Firefox (All platforms) and Internet Explorer (Safari support coming soon), LastPass allows importing from all major password managers including Firefox, Internet Explorer, RoboForm, Keepass, Password Safe, and MyPasswordSafe, Once imported all data is encrypted locally using one way salted hashes making using of strong AES encryption, this encrypted file is then stored on Lastpass servers allowing you to sync your password data on different computers using Windows, Mac, or Linux.