I use Newsbin Pro and it is, without doubt, the best program on my computer of any kind and the most used, by far:
http://www.newsbin.com/
My ISP has news service but it's not as comprehensive as I'd like so I subscribe to Giganews and have Newsbin configured to use their news servers:
http://www.giganews.com/
I have the Platinum plan as it allows unlimited downloads.
Trust me, Newsbin rocks. You'll wonder how you ever got along without it.
As an aside, I also use DC++ as well (the most comprehenive file sharing protocol I know of). You can find ANYTHING in the known universe using it. The amount of available content is probably in the millions of terabytes.