There are lots of people adding support for OpenID to their apps (awesome!) but there are some issues that will invariably cause confusion in these implementations if we don't develop some best practices around interaction design.

Limited Betas with OpenID

Using invite codes

BricaBox's private beta requires an invite code and the use of the email address that you received the code at when you sign up. They allow you to sign in with OpenID but unfortunately it seems that unless you've previously associated an email-based account with your OpenID, it'll complain that it doesn't recognize your OpenID, even if you have a valid invite code.

The problem with this scenario is that, once I've received my invite email, it should matter how I sign in. Once I've proven that I have a valid invite code (since I received the email), I should be able to sign in with my OpenID.

If they wanted to make sure that I sign up with the same email address that was invited, they should remove the "sign in with OpenID" option until later. Of course this kind of defeats the profile portability benefits of OpenID.

Using Whitelists

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