Mac users interested in Utorrent for mac g5 os x 10.5.8 generally download:
uTorrent is the world's most popular BitTorrent client, and is now available for Mac.
uTorrent Mac introduces uTP, a new lightweight BitTorrent protocol that makes incredibly efficient use of network bandwidth while reducing network problems.
uTorrent also supports the Protocol Encryption joint specification (compatible with Azureus 2.4.0.0 and above, BitComet 0.63 and above) and peer exchange.
uTorrent was written with efficiency in mind.