Here is a very simple iPhone optimized web interface – it allows for basic control of the uTorrent client (ver. 1.7.5).

You can:

See the status of active torrents
Pause, resume a torrent
Add a new torrent by entering a url to torrent (or minimova id)

Right now that is all you can do.

http://www.davidraso.com/utorrent-iphone/