Arduino LCD Alerts is a plugin for Pidgin so you can see what's happening while watching full screen movies or playing games and decide whether it's worth stopping to respond to or not. At the moment it's fairly basic, but there's a chance I might not update it much more since it pretty much does everything I need, so here it is for anyone to do whatever they want to.
The link below is the site with instructions on using it and a download link. This was written on Windows so you'll have to change which library the plugin uses and the serial port if you're wanting to run it on Linux. Just be aware that you can't have the plugin loaded without having an Arduino hooked up to your computer and for some reason you need to re-flash the sketch to your Arduino after unplugging it.
The requirements are Pidgin, an Arduino and 16x2 LCD using the LCD4Bit library.