Today I tested something in 12.04. I have Automatic login enabled with password. So When I login a window pops up asking for the password. But I tested the following. I clicked cancel twice in the pop up window so the window disappears for a while then I opened my Mozilla Firefox browser I went straight to Edit > Preferences > Saved passwords. I clicked show passwords and Voilá I had access all my account passwords without logging into Ubuntu.
Is this a bug or what? Is there a solution to make Ubuntu like in windows when a login screen comes up, I type my password than I access my desktop. It looks like that in Ubuntu the desktop and my files aren't blocked. Is there a solution to block everything while I type the password.