There's only one thing every Otaku needs next to air and water: Anime. In the last two years the BitTorrent filesharing system has proven to be the perfect choice to get your anime fast and efficiently. Recent studies (of 2008) have shown that more than 50% of all file sharing traffic is caused by BitTorrent clients.

uTorrent is a Windows BitTorrent client written in C++. It has important features like upload bandwith limitation and the ability to get single files from multi-file downloads.

Download uTorrent now.

Animesuki was a great website for torrent files tailored for the U.S. audience which means they only carried torrent files of unlicensed (which generally means: unlicensed in the U.S.) anime.

The site was updated multiple times every day. They also had a large archive of series for you. There was one downside: As far as I know they listed english fansubs only.