Hello, multipurpose! Seagate's Pogoplug-based FreeAgent DockStar -- at least at a glance -- isn't much good to those who aren't buying up DockStar HDDs. But if you dig a little deeper, you'll realize that this minuscule adapter packs a 1.2GHz Marvell processor, 128MB of RAM and 256MB of ROM. There's also a smattering of USB ports and an Ethernet socket; add that all up, and you've got a hacker's playground. One Hunter Davis decided to see just how much he could squeeze out of this here peripheral, which can be widely found for as little as $25 nowadays. Thanks to a copy of Debian Linux, a good bit of programming know-how, a DisplayLink USB-to-VGA ada