Mininova.org is one of the biggest and best torrent sites around for the time being. It has a healthy community and tones of software, games, books, TV shows, music and anime. Very simple and fast.
This should be any torrent searchers first stop. Always remember to read the comments and see what others have to say about each release. Because its a public torrent site some fake posts are around so its best to be cautious on what you download.
Final Word: Well known and full of content. An often first and last stop for your piracy needs.