ruTorrent is a web-frontend for rTorrent (A lightweight, powerful and versatile commandline torrent client for unix systems)
ruTorrent (+rTorrent) offer a native linux alternative to uTorrent; complete with RSS, Ratio Groups, Labels, Automove and many other features through plugins from it's active community + developers.
NOTE: As of yet there are no rutorrent widgets for other XBMC-Related software such as MediaFrontPage but ruTorrent serves a perfect standalone HTPC application.
Its developer describes it as:
"ruTorrent is a web frontend for rtorrent designed to emulate the look and feel of µTorrent WebUI so it's appearance is quite similar to the "parent". The name "RuTorrent" is the combination of µTorrent and rTorrent."
More info can be found at its googlecode page;
or in its forums;
I would especially recommend the following post showing a step-by-step guide for setting up rTorrent + ruTorrent on a linux system:
Post title: Ubuntu Seedbox with rtorrent | rutorrent | pureftpd | multi-user (optional)
I would recommend anyone to have a look at rTorrent/ruTorrent as it has been solid as a rock on my XBMC Box for over a year.