Scrapped Princess is my all time favorite anime series. Wonderful characters and plot, easy to get off bit torrent.

Fullmetal Alchemist is another great, and right now looks to surpass Scrapped Princess if it continues on it's current path.

If you don't mind buying, definitely pick up LaxtEXILE. It's an incredible series.

And I must second One Piece. Although it took a while for it to grow on me, I'm really starting to see why it's such a popular series in Japan.