Quick follow up say that I just released the PlugPC software. If you go in the "account" page of MeshCentral.com, there is an "install" link. You can select the PlugPC as the device architecture and the web site will show a bunch of lines you can cut & paste into a root command shell to install the agent. Basically create a directory, perform two wget's and setup some links to autostart. It's the simplest way I could find to get software installed. You may need to install wget, also make sure you can "ping meshcentral.com" from the plug. If you can't there is a DNS problem that needs fixing.
That's it. The mesh agent is self-upgrading, so you should only need to install it once. After that, as the web site evolves, more features will show up.