One of the things I love about OS X is the fact that for pretty much any conceivable task, there are multiple applications to choose from with which to do it. Unfortunately, this hasn't really been the case when it comes to BitTorrent clients. Yes, there may have been multiple native clients out there, but only two of them were really any good– BitRocket
and for the longest time, Transmission was banned on many private torrent trackers. This left only BitRocket, a client lacking some key features such as the ability to view and set upload/download ratios. Until Today.
Transmission 0.71 fixes the much hated multiple-announce bug which caused it's banning by many trackers. The new version also includes some other small bug fixes and interface updates. Transmission is Open Source and available as a free download.