Using as a GUI for a firewall in a datacenter (right now only used for a couple specific production servers, as a pilot, more or less) and as an openvpn server (again, for the GUI). Our organization is mostly windows-centric, so having the GUI so I don't have to either train other users or do routine operations myself is a necessity.
A side note, at least when I looked a year ago or so when I set this up, ebox is by far the simplest/nicest platform for certificate management, a key for openvpn. All the other web-based GUIs for PKI I've looked at are huge and extremely involved to get set up. When all you need is a single CA, this is nice, simple, and effective.