uTorrent Notifier is a .NET application that runs in the system tray and, well, notifies you of events ocurring remotely in uTorrent.
Supports notifications being sent by Growl, Prowl, Twitter and Boxcar.
See https://github.com/ejholmes/utorrent-notifier-daemon for a linux command line tool that can run as a daemon and send notifications.
Eric Holmes (eric@ejholmes.net)
Ryan Farley (http://ryanfarley.com)
Dave Nicoll (http://davenicoll.com)