BitLet (online torrent software) is a simple BitTorrent applet for downloading any torrent file. It uses the BitTorrent protocol.
In order to start downloading using BitLet you need the direct link to the .torrent file found on torrent search engines like mininova. Supernova torrent search engine provides a direct "download by bitlet" link. Just copy paste the link on bitlet.org.
Bitlet allows you to configure settings like incoming port and the maximum upload speed. Being a P2P applet, things that you have downloaded are downloading will be uploaded for others to download. Once you close the applet, no data will be downloaded or uploaded.There is an option to pause or resume downloads.
Bitlet claims that it doesn't save any reference to your hostname or IP address. However if you are concerned about the security , you may use BitLet with cookies disabled in your browser. You may read more about it here.