http://nzbindex.com is probably the best for making a RSS feed, but paid services are a lot faster and interactive.
Usenet is vast and very active in posts, so keeping up is a hard task - which is why you don't get it for free. "Releases" tend to appear on Usenet groups first before making it's way to the "open net". Plus, Unlike oneclick hosting services like Rapidshare/Depositfiles, P2P services like gnutella/emule, torrent sites like Piratebay/sumotorrents and chat/direct connect like mIRC, it's full speed connections, anonymous and unmonitored.