People are running NZBget on the old NSLU2 as it uses very little system resources so it should run on every Linkstation.
NZBGet is a command-line based binary newsgrabber for nzb files, written in C++. It supports client/server mode, automatic par-check/-repair and web-interface (via additional package). NZBGet requires low system resources and runs great on routers, NAS-devices and media players."
NZBget and NZB-web-interface so you don't have to do command line.