Torrent is a great way to transfer large files very quickly. However most torrent clients are gui based and have quite some impact on system resources (e.g. Azureus).
rTorrent is a lightweight client running from the terminal. Being able to run it in a screen session (also upon boot) makes it ideal to also control it from a remote location.
http://www.howtoforge.com/compile-rtorrent-from-svn-ubuntu-8.04-hardy-heron
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