Once I bought a dockstar, and was mightily annoyed by it. Eventually new Pogoplugs came out, and I invested a whopping nine bucks in a used pogoplug mobile. After having it deregistered by support, I tried installing ArchLinuxARM on it. This produced a brick with a flashing green light, so do not try to install Arch for ARM on this device. It's probably possible to make it work, but the default install instructions don't work. Further, the revert process didn't work either! Seems like their u-boot is broken for this device.

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.