Universal ID for website

I hope, one day, that there is a universal ID and password that can be used for all websites.

At present, we have to provide an ID and password for each website. Here are the problems:

* each website imposes its own non-standard constraints on the ID and password
* some ID cannot be accepted, as it has already been used
* we have to keep a record of all the different IDs and passwords used in the websites.

A few years ago, Microsoft wanted to introduce a "passport" that can solve this problem. This idea did not take off. I hope that Microsoft, Google or Yahoo will try again. Maybe, it will be accepted now.