I love Azureus, I really do. If you’re not familiar with it, it’s the java-based bit torrent client with enough bells and whistles to satisfy even an attention deficit santa’s helper, and it’s got a really great GUI. But it’s also got that ponderous JVM overhead and a voracious thirst for ram. If you’re on windows and you want a simple, lightweight alternative, check out utorrent. None of the bells and whistles of Azureus, but your system load will drop by an order of magnitude.