OK we have many posts for torrent sites but this one will include ONLY private torrent tracker sites (i.e. one's that require sign up). Also if possible include what content you can obtain from the sites.
Let me start with a few that i know, then you can add others also :
www.filelist.org (all sorts)
www.torrentleech.org (all sorts)
www.torrentbytes.net (all sorts)
www.bitmetv.org (tv shows)