In windows I used to have uTorrent for downloading my torrents. Under Linux I searched for a nice software which doesn’t take too much system resources. Atlast I found Deluge which is written in Python and has a very easy to use interface just like uTorrent.
It shows detailed statistics about the torrent you are downloading, multiple torrents download using the same interface, even a built-in search engine.
If you are using debian/ubuntu, Deluge can be apt-getted easily. Just add the followind lines to your sources.list file. There are two repositories, you can add either one of them.
deb http://deluge.mynimalistic.net/apt dapper main
deb http://espergreen.com/apt dapper main
After adding it, run
sudo apt-get install deluge
It requires python-libtorrent_0.4.0 but all the dependencies will be handled by apt-get automatically (why else do you use apt-get).
This new version 0.4 supports plugins and various plugins are available for monitoring the network, showing the graphs, monitoring CPU usage.