@Reņģis ♥ It is called “labs” for a reason. And many projects there are now used in production somewhere: Bespin is now the code editor in Github, TestPilot has several tenthousand installations, Sync, Personas and Jetpack are now part of Firefox Core, … Putting the identity management right in the browser is a very useful approach. And BrowserID even offers a fallback for legacy browsers not capable of it.

Have you heard of BrowserID before? It’s a Mozilla project where they try to move identification *in* the browser. A very promising approach, that might remedy some of your outlined problems: https://browserid.org/ (When I first learned about it I thought all the way back to your driver’s license post.)