Now a days  Torrent Search Engines offer a smart, free and fast  way to download large files .Many torrent engines are available on the net. The best five i found are following

1. Torrentz is the best leading meta-search available http://torrentz.eu
2. 1337x torrentz provides good torrent downloads with reviews of the movies,ebooks etchttp://1337x.org
3.The Pirate Bay is also gaining popularity on the internet