Here’s a nice feature of Safari: it’s very well integrated with Apple’s “keychain” service, a central, secure repository for username and password information. While other browsers allow you to save password on your keychain, Safari is the only browser that doesn’t simply “type them into the password dialog” for you; once you enter your username and password for a site in Safari, you have regular, seamless access to it.
There was a version of Internet Explorer for Windows that tried this several years ago — I believe there was an option like “enter this password automatically every time?”. Somehow the feature was removed.
Makes you realize how annoying it is to have to enter your username and password — or even just confirm it — so often.