A better idea might be to use a browser extension or applet built with the Stack Exchange API. For example, here's one for Chromeone for Chrome, and another oneanother one for Firefox, Chrome and Opera, that does exactly what you want, and more. Find more of these apps on Stack Apps.
You can also try following the Ask Ubuntu twitter feed or the RSS feed. In short, there are so many ways to be informed of new questions, there really isn't a need to build something like this into the site itself.