I use Munin to monitor stuff on the home network. Recently, I added a couple monitors - one is a simple web scrape for the new Boxee box that replaced the dedicated HTPC running GBPVR, the other for a Win7 VM (running under Virtual Box on my Ubuntu server, just like the CentOS image that drives this Drupal blog...) needed to run the Boxee Media Manager and also to stream content to the Xbox.