You'll see print supply levels on supported printers. The current supplylevel is held in the HW field.
If you enable SNMP on a ESXi host, and CDP on its vSwitch (e.g. esxcfg-vswitch -B both vSwitch1), it can be discovered automatically. VMs are shown as modules as well. If ssh access is enabled in addition, the VMs can be turned on and off.
Graphs can be displayed with the interfaces by checking the appropriate boxes on the top. They're tiny unless you select large graphs in User-Profile. Otherwhise the counter values are shown. If the absolute counter is not 0, the background is blue. Recent IF status changes, high IF errors or PoE values will be highligthed as well. The idea behind this is to show you which ports can be re-patched on a fully occupied switch. Chances are you won't get complaints if you unplug a port where:
pops up a realtime SVG graph window, which lets you observer the traffic in a 3 second interval.
You can modify log/devtools.php in System-Files to include links to external tools.