TorrentZap.com puts all the comments posted on torrents on different bittorrent indexing websites in one place, just submit the infohash of the torrent and press "Show Comments".
Websites included:
Mininova.org -
Fulldls.com -
Torrentreactor.net -
Torrentportal.com -
Sumotorrent.com -
Fenopy.com -
myBittorrent.com