Since somebody seems to have problems keeping up with upgrades no matter how well its published, one solution would be to use this plugin to send an email to a mail-to-sms service. Then its no excuses.

Maybe someone may make a bookmarklet that displays a 100px blinking red overlay in the browser saying: New WordPress release available: UPDATE NOW !! :/

...or maybe the "Lazy admin sequrity insurance plugin", a plugin that locks WordPress down with htaccsess if its not running latest version.

:P