OpenID – I have yet to see it work reliably across more that one platform!
everyone seems to do it differently and then they add that ssl verification sillyness as well to break what little did work?
we need something everyone can easily use, without needing to sign up to third party services or buy anything so that a page can say to another page „it’s me again“
(at the end of the day much of this is about having some kind of id so that spammers and abusers can be banned. it doesn’t really have to give anyone personal info to do that)