I recently bought a Seagate Freeagent Go Dockstar, which is basically a SheevaPlug device with less RAM and Flash memory for a lot less money (~ $25). It comes with the same 1.2 GHz Feroceon 88FR131 CPU as the SheevaPlug. Unfortunately my Dockstar device arrived in dead condition.
When I first started the device its LED was flashing green for a few seconds (boot loader phase) and then began flashing amber. That is all that was happening. It did not aquire an IP address from my DHCP server nor was it reachable on its default IP address.
As I did not want to bring it back to the store where I bought it and because I intended not to use the pre-installed Pogoplug software anyway, I opened the device to check what was going on.