Transmission is awesome, takes up almost no resources.
if you guys d/l tv shows, this site is amazing for torrent, and they're updated probably 1 hr after the show is aired.
EZTV - TV Torrents Online
just make sure you keep your ratio to at least 1:1, that means you send as much as you receive, it will help the community run faster, and it's not that hard cause there're tons of people downloading and uploading.