So, I built an alarm to notify our team of build failures.
Here's a shot of the internals:
It has an audible alarm and strobe light, is controlled via USB and runs off 12v power. The control software uses the RSS feed from our build server to watch for failures, and sets off the alarm accordingly.
This was a really fun project, and I'm still hunting around for cool electronics to hook up to it (I still have 2 open relays!)