Login with your OpenID account (what is OpenID?) so you can create proposals and come back later to edit them.  All of the accounts from last year have been carried over.  Unfortunately, google discontinued their OpenID server, so if you relied on google please email contact@linuxplumbersconf.org with a new OpenID url and we'll update it for you (or just create yourself another).

The easiest current OpenID provider to get an account with is Launchpad/Ubuntu One.