MyOps observes the operational state of PlanetLab and enforces global policies at member sites. MyOps observes three principle objects in PlanetLab: Sites, Nodes, and Power Control Units (PCUs). Based on the observed state of these objects, MyOps applies policies to member sites that are expected to improve the operational state of the whole system.
If you'd like to track things a little more informally, you can install these Google Gadgets for summaries of the entire system or a specific site.