µTorrent is quite an impressive BitTorrent client that acquired a strong reputation almost three years ago for its tiny footprint and minimal use of system resources. The latest stable version (1.8.1) is just 263 kB in size and yet it boasts a wealth of features, including global and per-torrent speed limiting, simultaneous downloads, RSS auto-downloading, built-in scheduler, support for Mainline DHT and more.
It also has a minimalist, intuitive interface and supports the protocol encryption joint specification to prevent arbitrary throttling by certain Internet service providers. µTorrent is probably not a new name for torrent lovers using Windows, but one of the reasons I chose it as this week's recommended download is that for the first time this nifty little client has become available for the Mac as well - as it was promised when acquired by BitTorrent Inc. back in 2006.
The Mac release only runs on Leopard/Intel Macs at the moment, and is still in Beta, so there's a chance you will encounter some bugs here and there. I haven't had a chance to thoroughly test the Mac version yet, but if you give it a try, feel free to share your experience in the comments.