The Seagate Dockstar is the lowest-end PogoPlug device, a tiny low-power ARM server which runs Linux. Devices like this are ubiquitous now, but when the PogoPlug came out it was extremely unusual. It also cost substantially more than it does today, when a Rev.2 PogoPlug (not the new-new one, the old new one) is only $20. The only cheaper ARM-based server I know of is the Dockstar, which can be had for as little as $14 through Amazon today. Regardless of which PogoPlug you might have, you probably want to run Debian Squeeze with a recent kernel featuring LED support, which is not that difficult — but finding all the information you need is.
The dockstar doesn't have an RTC to keep costs down. If you're running Debian Squeeze (and you probably should be) then you can make the following tweak to /etc/init.d/ntp to use ntpdate (which you should also install) to set the time before running ntp.
Today I reinstalled Debian Lenny on my Dockstar. I thought it was bricked, but it isn't. I never did manage to get the CA-42 serial cable working, though, so now it has a useless tail. If I ever do brick it I guess I'll revisit the issue.