iOS: 1Password for iOS got an update today that drastically improves the extension and makes it easier to use 1Password with other apps. It's now about as feature-packed as the desktop extension.
With the new update, the 1Password extension can now fill in identities, credit cards, create logins and passwords, and access all that in both Safari and any other third-party app that integrates it. The form-filling alone makes making purchases from mobile a lot faster and it's nice to have near feature consistency with the desktop extensions so you're not confused about what's possible on iOS.
1Password (Free) [iTunes App Store]