It would be great if I could store a link to theoldreader.com that already includes the email address I wanted to use for logging in. For example Google reader supported links like reader.google.com/?email=my@address.com, in which case the email address was automatically filled in and the password field focused.
Also a similar effect could be achieved if at least there was a keyboard shortcut or direct link to the login page (eliminating the need to grab the mouse and click after entering the url).