I have a wonderful system to get around the anime I have on comp - delete all the things you have watched and keep links to unwatched, but downloaded stuff in utorrent.
Its quite nice, you do not need to re-download or something the trorrent when you move the thing and you keep on seeding until you watch it(it is good to seed right?). Its not like I watch the anime at the moment when I download it (well sometime, then I just remember what I have seen).
To keep track on which episode I sopped watching I just mark normal/hight priority in utorrent file list.
And to keep track of seen but deleted anime I just mark them as seen in
anidb.net. It might be a bit unfair, because there are something like 30-60 animes I have but haven't seen, but then again - I will watch it if its worth watching and I might even rate it if I am up to it
