We don't want your password either! Instead, we just ask an organisation we trust (such as Google, Yahoo or AOL) whether they know you. If they vouch for you, then you're good with us. If you're asked for a password, it will be by your account provider, not by us.
OpenID is a much safer way to limit your personal information online than giving your password to every site you use.
Gravatar is a 'globally recognized avatar'. It means that you can add a gravatar to their site and use that image on ANY site that supports Gravatar, such as Dive Seven. It means that you can spend less time dealing with your profile photos and more time diving!
Once you've signed up at Gravatar, link your email address with your favorite profile pic and it will appear on Dive Seven automagically.