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Transmission is a cross-platform BitTorrent client that is:

Easy.
Transmission is designed from the ground up to balance power with simplicity. We've set initial preferences so things "Just Work", while advanced features like watch directories, bad peer blocking, and the web interface can be configured with just a few clicks. When Ubuntu chose Transmission as its default BitTorrent client, one of the most-cited reasons was its easy learning curve.

Lean.
With few dependencies and written in C, Transmission has the lowest memory footprint of any BitTorrent client we've seen. It's also the client of choice on low-memory hardware. Imageshack chose Transmission for its BitTorrent farms because the competition "requires amounts of memory several times greater than Transmission".

Powerful.
Transmission has the features you expect in a BitTorrent client: encryption, a web interface, peer exchange, DHT, UPnP and NAT-PMP port forwarding, web seed support, watch directories, tracker editing, global and per-torrent speed limits, and more.

Transmission-Qt is a powerful and easy to use BitTorrent client that enables users to share files.

Transmission-Qt is an unofficial build that brings to Windows users all the features of the original application.