One of the greates pieces of software I’ve found in a looong while is Xtorrent, it’s the simplest and most effective torrent client I’ve ever tried (and it looks great). The search is integrated, no more going through torrent site after torrent site, downloading the little file and opening in another software, just search, order by number of seeds, double click and there you go. Xtorrent found me a popular fast downloading links for everything I’ve searched for and it’s stable as hell without sucking ressources like a lot of it’s competitors. Kickass application.
(Phil Ryu has a detailed review.)