pogoplug I have 2 version 3 pogos (V3) and 1 version 2 (V2). Right now you can get a V3 at jr.com for $20 which is what I paid for mine. The V3's have an internal SATA port which doubles the disk speed vs USB disks. I run Arch Linux on mine and now have MythTV backend running on the 3 of them with an HDHomeRun Prime and an older HDHomeRun dual. I use the SATA ports and overclock the V3's from 700 MHz to 850. And the cpu's are dual core on the V3's. They are pretty cool devices if you want to tinker with them.
And no, I have no affiliation with either j&r or pogo.