Headphones is a tool that automates your music downloading. It's written in Python (2.6 or 2.7) so it works on pretty much all systems. It's easy to setup and configure. Downloading with NZBGet, SabNZBd, Transmission and uTorrent is supported.
It can be configured to work with a few search providers, including NZBs.org and Newznab servers. Just enter your account details and you're ready to go.