for the command pine i would recomend rtorrent, the libtorrnt client or enhanced ctorrent as thier are some clients that wont talk to ctorrent because of the bugs it has
the NSLU guys forked the project as the main developer has been AWOL for abut a year now its called enhanced ctorrent and have added many features as well as fixed alot of bugs
i recomend you find someone to recompile it for you, i should have a compiling server up soon (a week or so) that you can ssh into and have a complete dev enviroment to compile somthin like this (native arm as well so no cross compiling)