You know, with all the little browser-chrome experiments that have been going on lately, I'm really surprised that no one has tried to make HTTP-authentication-based login/logout/account management as painless as HTML-served variants. I'd imagine that it would couple with the little "lock" icon in the URL/status bar, making it have four states instead of two: "insecure, secure, insecurely logged in, and securely logged in" where clicking on it brings up a menu to both view credentials and change your password/edit profile/log out/close account/sign up/anything else browser makers want to implement. (They could be distinct, of course, but I like the idea of making "insecure" look scary so that users would be deterred from sending credentials through it.