I was going to title this blog post "I don't want your stinkin' password!" but realised that this isn't the first site that uses entirely OpenID, OAuth and stuff.
On Around The World you can now log in with either your Google account, your Twitter account or simply by entering your email. It looks like this:
What's neat about this is that it works independent of if you've signed in before (aka. log in) or if you're new (aka. register).
What's not so neat about it is that people might not recognize it. We're so used to both registration forms and log in forms to ask for passwords. Often, you can quickly tell of it's log in because you expect two input fields.
Another slight flaw with this is the fact that my emails usually take several tens of seconds to send. This is because they're sent by a cron job async. So, people who enter their email address might get disappointed if they don't get the email immediately.
Anyway, let's wait and see if people actually use it. At least it means you don't really need a third party service and you don't need to type in a password.