This utility allows you to see the status of several different Unix/Linux web servers at a glance. This is useful for hosting resellers, or anyone with hosting on multiple servers. The page can be placed on any computer supporting PHP (eg your local machine) and will attempt to contact the script on whatever servers you specify.
The latest version (2010-04-01) also has a summary view, which shows only server load and uptime. This is much more compact than the full view - great if you're monitoring lots of servers.