Transdroid is an Android remote client for your torrent application running on a server or home computer. Currently Transmission, uTorrent, Bittorrent, Deluge and rTorrent are supported. It can show the active torrents, pause, resume or remove them and new torrents can be added via URL or as an extra via an isoHunt-powered search.
The application is currently in extensive development and can be beta-tested. It is open-source and free.
More information can be found on the public website.
Bugs and feature request go into the issue tracker.
Some code statistics (Transdroid is open source!)