Unison is a carefully-crafted, genuinely revolutionary Mac OS X Usenet newsreader. It offers all the expected newsreader functionality: easy-to-navigate threaded discussions, the ability to ignore annoying posters, multiple signature management, and easy, Mail-like posting with spell checking and all the trimmings.
With Unison you can discuss, download audio, view pictures, find video and more.
General Features:

• Binary Uploading.
• Improved Download Manager.
• Four Ways To Browse – Messages, files, music and photos.
• Live MP3 Streaming.

15 day trial for Mac OS X 10.3.9.