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.
My Compaq nw9440 laptop has a Conexant HSF soft modem. To make a long story short, the only way to get it to work on Linux (that I know of, anyway) is to use the commercial Linuxant drivers. Conexant paid them to sell drivers, and they're twenty bucks. It's not a bad deal compared to 3com, which does not and may never have Linux support for Winmodems (especially older ones.)