Azureus 2.5.0.4. I'm seeding or downing up to 200 torrents at a time, and the only client with a hope of managing them half as decently as µTorrent is Azureus. Transmission will not become a viable candidate for power users until they redesign its interface to make it capable of working with far larger numbers of torrents. It can't be that hard to code; BitRocket got it, and that client is ridiculously lacking in features. xTorrent, Deluge, Azureus, µTorrent, etc. have the design. Transmission needs to abandon that ridiculous vertical layout and join the horizontal standard.