
Their download management "trick" is simply called Leech, and the current version is 1.1. This program gives you complete control over your downloads, offering queue, pause and resume, download from password-protected servers and the ability to store your passwords using the keychain.
The minimum requirements of this program are pretty light, in my opinion - Mac OS X Version 10.5 Leopard or later, 2.2 MB Hard Drive space and a Internet connection should be enough. Leech 1.1 is available as a Universal Binary for PowerPC and Intel-based Macs, and its price is €6.95, but a trial version is also available.