Actually, Area51 *can* be added to StackApplet - but not in the way you might think. Although Area51 itself has no API (and therefore is not supported in StackApplet), the Area51 discussion zone does provide an API.
Unfortunately StackApplet does not include the Area51 Discussion zone in the list of sites. You will have to manually add it by editing the configuration file in ~/.stackapplet/config. Therefore I will consider fixing this in a future version of StackApplet.
Actually, Area51 *can* be added to StackApplet - but not in the way you might think. Although Area51 itself has no API (and therefore is not supported in StackApplet), the Area51 discussion zone does provide an API.
Unfortunately StackApplet does not include the Area51 Discussion zone in the list of sites. You will have to manually add it by editing the configuration file in ~/.stackapplet/ config. Therefore I will consider fixing this in a future version of StackApplet.